remove src/libgb/Makefile.am
libgb has been obsolete for years, but the Makefile.am is still there.
src/Makefile.am does not list it as a subdir, so it's just dangling legacy.
diff --git a/openbsc/src/libgb/Makefile.am b/openbsc/src/libgb/Makefile.am
deleted file mode 100644
index 1592431..0000000
--- a/openbsc/src/libgb/Makefile.am
+++ /dev/null
@@ -1,9 +0,0 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall -fno-strict-aliasing $(LIBOSMOCORE_CFLAGS) \
- $(LIBOSMOVTY_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(COVERAGE_CFLAGS)
-
-noinst_LIBRARIES = libgb.a
-
-libgb_a_SOURCES = gprs_ns.c gprs_ns_frgre.c gprs_ns_vty.c \
- gprs_bssgp.c gprs_bssgp_util.c gprs_bssgp_vty.c \
- gprs_bssgp_bss.c common_vty.c