hooks/prepare-32bit: introduce lib32symlinks.

- This creates a symlink of a file stored in usr/lib32 to usr/lib.
- This expects basename of files stored in usr/lib32.
- This is required by an upcoming change to the glibc pkg.

common/environment/setup-subpkg/subpkg.sh

@@ -12,7 +12,7 @@ unset -v nostrip nostrip_files shlib_requires
 unset -v noverifyrdeps allow_unknown_shlibs shlib_provides
 
 # hooks/post-install/06-prepare-32bit
-unset -v lib32depends lib32disabled lib32files lib32mode
+unset -v lib32depends lib32disabled lib32files lib32mode lib32symlinks
 
 # xbps-triggers: system-accounts
 unset -v system_accounts system_groups

common/hooks/pre-pkg/05-prepare-32bit.sh

@@ -4,6 +4,7 @@
 #	- lib32depends: if set, 32bit pkg will use this rather than "depends".
 #	- lib32disabled: if set, no 32bit pkg will be created.
 #	- lib32files: additional files to add to the 32bit pkg (abs paths, separated by blanks).
+#	- lib32symlinks: makes a symlink from lib32 to lib of the specified file (basename).
 #	- lib32mode:
 #		* if unset only files for libraries will be copied.
 #		* if set to "full" all files will be copied.
@@ -160,6 +161,12 @@ hook() {
 		mkdir -p ${_targetdir/\/usr\/lib/\/usr\/lib32}
 		cp -a ${PKGDESTDIR}/${f} ${_targetdir/\/usr\/lib/\/usr\/lib32}
 	done
+	# Additional symlinks to the native libdir.
+	for f in ${lib32symlinks}; do
+		echo "$pkgver: symlinking $f to the native libdir..."
+		mkdir -p ${destdir32}/usr/lib{,32}
+		ln -sfr ${destdir32}/usr/lib32/$f ${destdir32}/usr/lib/$f
+	done
 	# If it's a development pkg add a dependency to the 64bit pkg.
 	if [[ $pkgname =~ '-devel' ]]; then
 		echo "   RDEP: ${pkgver}"