move openbsc.pc to osmo-sgsn.pc

Change-Id: Iad28d85b2a6d175cbe5d506aa82e7e4d94111eff
diff --git a/Makefile.am b/Makefile.am
index 536b3f4..d57b66d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -17,7 +17,7 @@
 	$(NULL)
 
 pkgconfigdir = $(libdir)/pkgconfig
-pkgconfig_DATA = openbsc.pc
+pkgconfig_DATA = osmo-sgsn.pc
 
 BUILT_SOURCES = $(top_srcdir)/.version
 EXTRA_DIST = git-version-gen osmoappdesc.py .version