Multiple changes to gnu_configure style packages, as well as other

changes to allow better linking flags in future packages through
pkg-config.

Removed the PKGFS_TEMPLATESDIR, PKGFS_DEPSDIR and others that weren't
too useful. Instead use a single PKGFS_DISTRIBUTIONDIR on which all
those directories/files can be found.

Added a template helper for pkg-config, that changes a pkg-config file
after it's installed to produce correct linker paths.

More helpers could be added in the future.

--HG--
extra : convert_revision : a42fd2e72915a4219714de92579011bca2b0f4a6

helper-templates/pkg-config-transform.sh

@@ -0,0 +1,26 @@
+#! /bin/sh
+#
+# This script will transform the pkg-config files with correct
+# directories pointing at PKGFS_MASTERDIR specified in the config file.
+#
+
+: ${sed_cmd:=/usr/bin/sed}
+: ${mv_cmd:=/bin/mv}
+
+transform_pkgconfig_file()
+{
+	local file="$1"
+
+	[ -z "$file" ] && return 1
+
+	$sed_cmd	\
+		-e "s|^exec_prefix=$PKGFS_DESTDIR/$pkgname.*$|exec_prefix=\${prefix}|" \
+		-e "s|-L\${libdir}|-L\${libdir} -Wl,-R\${libdir}|" \
+		$file > $file.in && \
+	$mv_cmd $file.in $file
+	[ "$?" -eq 0 ] && \
+		echo "=> Transformed pkg-config file: $(basename $file)."
+}
+
+transform_pkgconfig_file "$1"
+exit 0