common/hooks: add support for do-<phase> hooks as suggested by Gottox.

- New hooks for do-fetch and do-extract moved from xbps-src.
- Renamed some hooks to have XX as prefix.

common/hooks/pre-configure/00-gnu-configure-asneeded.sh

@@ -0,0 +1,13 @@
+# This hook enables ld(1) --as-needed in gnu-configure packages.
+
+hook() {
+	: ${configure_script:=./configure}
+
+	if [ ! -f ${configure_script} ]; then
+		return 0
+	fi
+	# http://lists.gnu.org/archive/html/libtool-patches/2004-06/msg00002.html
+	if [ -z "$broken_as_needed" -a "$build_style" = "gnu-configure" ]; then
+		sed -i "s/^\([ \t]*tmp_sharedflag\)='-shared'/\1='-shared -Wl,--as-needed'/" ${configure_script}
+	fi
+}