[libgee] Use a portable sed(1) construct to retrieve $libgee_dlname, fixes bug #688106

[Jasper Lievisse Adriaanse <jasperla src gnome org>]

commit 61a5947565d881c818bf57313927011675df1528
Author: Jasper Lievisse Adriaanse <jasper humppa nl>
Date:   Sun Nov 11 19:37:29 2012 +0100

    Use a portable sed(1) construct to retrieve $libgee_dlname, fixes bug #688106

 gee/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gee/Makefile.am b/gee/Makefile.am
index a559e59..c6081f2 100644
--- a/gee/Makefile.am
+++ b/gee/Makefile.am
@@ -121,7 +121,7 @@ typelib_DATA = \
 # Extract dlname from libfolks.la; see bug #658002.
 # This is what g-ir-scanner does.
 libgee_dlname = \
-	`$(SED) -n "s/^dlname='\([A-Za-z0-9.+-]\+\)'/\1/p" libgee-0.8.la`
+	`$(SED) -nE "s/^dlname='([A-Za-z0-9.+-]+)'/\1/p" libgee-0.8.la`
 INTROSPECTION_COMPILER_ARGS= \
 	-l $(libgee_dlname)
 Gee-0.8.typelib: Gee-0.8.gir