find-libdeps: fix extraction of soname

libperl.so results in soname="libperl.so.so" which is wrong.

This returns the correct string: "libperl.so"

Fix-by: Dave Reisner <dreisner@archlinux.org>
Signed-off-by: Florian Pritz <bluewind@xinu.at>
Signed-off-by: Pierre Schmitz <pierre@archlinux.de>

find-libdeps.in

@@ -3,6 +3,7 @@
 m4_include(lib/common.sh)
 
 set -e
+shopt -s extglob
 
 IGNORE_INTERNAL=0
 
@@ -40,7 +41,7 @@ fi
 
 process_sofile() {
 	# extract the library name: libfoo.so
-	soname="${sofile%%\.so\.*}.so"
+	soname="${sofile%.so?(+(.+([0-9])))}".so
 	# extract the major version: 1
 	soversion="${sofile##*\.so\.}"
 	if [[ "$soversion" = "$sofile" ]] && (($IGNORE_INTERNAL)); then