prefix sub-directories containing libraries with 'lib'
... and make sure tests work again after restructuring
diff --git a/openbsc/src/Makefile.am b/openbsc/src/Makefile.am
index 489dc58..005ce6b 100644
--- a/openbsc/src/Makefile.am
+++ b/openbsc/src/Makefile.am
@@ -2,7 +2,7 @@
AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOVTY_CFLAGS) $(COVERAGE_CFLAGS)
AM_LDFLAGS = $(LIBOSMOCORE_LIBS) $(COVERAGE_LDFLAGS)
-SUBDIRS = common abis mgcp bsc trau osmo-nitb osmo-bsc_mgcp utils ipaccess gb gprs
+SUBDIRS = libcommon libabis libmgcp libbsc libtrau osmo-nitb osmo-bsc_mgcp utils ipaccess libgb gprs
# Conditional modules
if BUILD_NAT