Add a .gdb_index section before splitting debug info

Using gdb-add-index to add a .gdb_index section before splitting
debug info (together with enabling "maintenance set debuginfod
download-sections" in GDB) can dramatically reduce the amount of
data GDB has to download.

Fixes #205.

Signed-off-by: Allan McRae <allan@archlinux.org>

scripts/libmakepkg/tidy/strip.sh.in

@@ -89,6 +89,11 @@ collect_debug_symbols() {
 			return
 		fi
 
+		# add GDB index if gdb-add-index is present
+		if type -p gdb-add-index >/dev/null; then
+			gdb-add-index "$binary"
+		fi
+
 		# copy source files to debug directory
 		package_source_files "$binary"