Remove pkg-config file

It's an artefact of split which is unused anyway.

Change-Id: I15c0b4457c108c7791b0f30b79660d9e6d09b269
diff --git a/include/osmocom/msc/Makefile.am b/include/osmocom/msc/Makefile.am
index 4099c9e..1419e8e 100644
--- a/include/osmocom/msc/Makefile.am
+++ b/include/osmocom/msc/Makefile.am
@@ -6,6 +6,7 @@
 	a_iface_bssap.h \
 	arfcn_range_encode.h \
 	auth.h \
+	bsc_api.h \
 	bsc_msc.h \
 	bsc_msg_filter.h \
 	bsc_rll.h \
@@ -66,13 +67,3 @@
 	vlr.h \
 	vty.h \
 	$(NULL)
-
-openbsc_HEADERS = \
-	bsc_api.h \
-	gsm_04_08.h \
-	meas_rep.h \
-	$(NULL)
-
-# DO NOT add a newline and '$(NULL)' to this line. That would add a trailing
-# space to the directory installed: $prefix/include/'openbsc '
-openbscdir = $(includedir)/openbsc