reverted erroneous part of 16030 commit (this will fix libtool builds)

src/Makefile.am

@@ -158,7 +158,7 @@ libvlc_la_CFLAGS = `$(VLC_CONFIG) --cflags vlc`
 libvlc_la_CXXFLAGS = `$(VLC_CONFIG) --cxxflags vlc`
 libvlc_la_OBJCFLAGS = `$(VLC_CONFIG) --objcflags vlc`
 libvlc_la_LDFLAGS = `$(VLC_CONFIG) --libs vlc builtin|sed -e 's/\(modules\/[^ ]*\)\.a /\1_builtin.la /g'` \
-		-avoid-version -no-undefined -shrext $(LIBEXT).0d
+		-avoid-version -no-undefined
 libvlc_la_DEPENDENCIES = stamp-builtins