mesa: use symlinks for megadrivers + correctness fixes

This is now using symlinks for megadrivers, which should eliminate
pretty much all of the sketchy strip stuff. In addition:

1) pipe drivers are now installed in opencl where they should be
2) ditched redundant devel dependencies (most of those were made
   redundant by glvnd, some of them were always redundant)

srcpkgs/mesa/patches/megadriver-symlinks.patch

@@ -0,0 +1,25 @@
+This converts megadriver installation to use symlinks so that we do
+not have to deal with skipping the strip stage for some files, as
+a result simplifying our template greatly.
+
+--- a/bin/install_megadrivers.py
++++ b/bin/install_megadrivers.py
+@@ -56,7 +56,7 @@ def main():
+         if os.path.lexists(abs_driver):
+             os.unlink(abs_driver)
+         print('installing {} to {}'.format(args.megadriver, abs_driver))
+-        os.link(master, abs_driver)
++        os.symlink(os.path.basename(master), abs_driver)
+ 
+         try:
+             ret = os.getcwd()
+@@ -71,8 +71,7 @@ def main():
+         finally:
+             os.chdir(ret)
+ 
+-    # Remove meson-created master .so and symlinks
+-    os.unlink(master)
++    # Remove meson-created symlinks
+     name, ext = os.path.splitext(master)
+     while ext != '.so':
+         if os.path.lexists(name):

srcpkgs/mesa/patches/no-unlink-megadrivers.patch

@@ -1,15 +0,0 @@
-This patch is needed to retain the master .so, so that only that filename is
-stripped while the related hard links are excluded.
-diff --git bin/install_megadrivers.py bin/install_megadrivers.py
-index 470137e..7d56def 100644
---- a/bin/install_megadrivers.py
-+++ b/bin/install_megadrivers.py
-@@ -71,7 +71,7 @@ def main():
-             os.chdir(ret)
- 
-     # Remove meson-created master .so and symlinks
--    os.unlink(master)
-+    #os.unlink(master)
-     name, ext = os.path.splitext(master)
-     while ext != '.so':
-         if os.path.lexists(name):

srcpkgs/mesa/template

@@ -1,7 +1,7 @@
 # Template file for 'mesa'
 pkgname=mesa
 version=21.2.5
-revision=1
+revision=2
 build_style=meson
 configure_args="-Dglvnd=true -Dshared-glapi=enabled -Dgbm=enabled -Degl=enabled
  -Dosmesa=true -Dgles1=enabled -Dgles2=enabled -Dglx=dri -Ddri3=enabled
@@ -264,17 +264,15 @@ libOSMesa_package() {
 }
 
 MesaLib-devel_package() {
-	depends="xorgproto libxshmfence-devel libXext-devel libXxf86vm-devel
-	 libXdamage-devel expat-devel libXfixes-devel libX11-devel libxcb-devel
-	 libdrm-devel libglvnd-devel
-	 libOSMesa>=${version}_${revision} libgbm-devel>=${version}_${revision}
-	 mesa>=${version}_${revision}"
+	depends="mesa>=${version}_${revision} libOSMesa>=${version}_${revision}
+	 libgbm-devel>=${version}_${revision}"
 	if [ "$_have_vmware" ]; then
 		depends+=" libxatracker>=${version}_${revision}"
 	fi
 	if [ "$_have_opencl" ]; then
 		depends+=" mesa-opencl>=${version}_${revision}"
 	fi
+	depends+=" libdrm-devel libglvnd-devel"
 	short_desc+=" - development files"
 	pkg_install() {
 		vmove usr/include
@@ -304,6 +302,7 @@ mesa-opencl_package() {
 	depends="libclc"
 	pkg_install() {
 		vmove etc/OpenCL
+		vmove usr/lib/gallium-pipe
 		vmove "usr/lib/libMesaOpenCL.so.*"
 	}
 }
@@ -313,14 +312,7 @@ mesa-dri_package() {
 	depends="mesa-${version}_${revision}"
 	shlib_provides="libgallium_dri.so" # workaround for mesa-dri-32bit
 	pkg_install() {
-		# Only strip each megadriver once, via its master filename
-		nostrip_files=$(find "${DESTDIR}/usr/lib/dri" \
-		 ! -name 'libmesa_dri_drivers.so' ! -name 'libgallium_dri.so' \
-		  -type f -printf '%f ')
-		vmove "usr/lib/dri"
-		if [ -d "$DESTDIR/usr/lib/gallium-pipe" ]; then
-			vmove "usr/lib/gallium-pipe/pipe_*.so"
-		fi
+		vmove usr/lib/dri
 	}
 }
 
@@ -328,8 +320,6 @@ mesa-vaapi_package() {
 	short_desc="Mesa VA-API drivers"
 	shlib_provides="libgallium_drv_video.so" # workaround for mesa-vaapi-32bit
 	pkg_install() {
-		nostrip_files=$(find "${DESTDIR}/usr/lib/dri" \
-		 ! -name 'libgallium_drv_video.so' -type f -printf '%f ')
 		vmove "usr/lib/dri/*_drv_video.so"
 	}
 }
@@ -337,8 +327,6 @@ mesa-vaapi_package() {
 mesa-vdpau_package() {
 	short_desc="Mesa VDPAU drivers"
 	pkg_install() {
-		nostrip_files=$(find "${DESTDIR}/usr/lib/vdpau" \
-		 ! -name 'libvdpau_gallium.so*' -type f -printf '%f ')
 		vmove "usr/lib/vdpau/libvdpau_*"
 	}
 }
@@ -346,8 +334,6 @@ mesa-vdpau_package() {
 mesa-XvMC_package() {
 	short_desc="Mesa XvMC drivers"
 	pkg_install() {
-		nostrip_files=$(find "${DESTDIR}/usr/lib/libXvMC"* \
-		 ! -name 'libXvMCgallium.so' -type f -printf '%f ')
 		vmove "usr/lib/libXvMC*"
 	}
 }