grub: remove the strip(1) wrapper before building.

... otherwise the modules won't be stripped.

srcpkgs/grub/template

@@ -1,7 +1,7 @@
 # Template file for 'grub'
 pkgname=grub
 version=2.00
-revision=19
+revision=20
 hostmakedepends="flex"
 makedepends="libusb-compat-devel ncurses-devel freetype-devel
  liblzma-devel device-mapper-devel font-unifont-bdf fuse-devel"
@@ -48,6 +48,9 @@ do_configure() {
 }
 
 do_build() {
+	# XXX remove the strip wrapper
+	rm ${XBPS_WRAPPERDIR}/strip
+
 	msg_normal "Building BIOS grub...\n"
 	cd $wrksrc/bios_build
 	make ${makejobs}
@@ -60,9 +63,6 @@ do_build() {
 }
 
 do_install() {
-	# xxx remove the strip wrapper
-	rm ${XBPS_WRAPPERDIR}/strip
-
 	if [ -n "${_GRUBX64}" ]; then
 		cd $wrksrc/efi_build
 		make DESTDIR=$DESTDIR/efi install