BuildSystem: Automatically delete libtool files

Half of the ports had a manual post_install step to delete libtool files
this is now done automatically and there is no need for it!

Libtool files have to be deleted as libtool doesn't work while
cross-compiling (at least out of the box)

ports/libtiff/build.sh

@@ -6,9 +6,3 @@ DOWNLOAD_URL="https://download.osgeo.org/libtiff/tiff-$VERSION.tar.gz#67160e3457
 TAR_CONTENT="tiff-$VERSION"
 DEPENDENCIES=('zlib' 'zstd' 'libjpeg')
 CONFIG_SUB=('config/config.sub')
-
-post_install() {
-	# remove libtool files
-	rm -f $BANAN_SYSROOT/usr/lib/libtiff.la
-	rm -f $BANAN_SYSROOT/usr/lib/libtiffxx.la
-}