install only ranap headers, make rua and hnbap headers 'noinst'.

Only ranap will be used in external code, hnbap and rua use will be limited
to the osmo-iuh repos.

include/osmocom/hnbap/Makefile.am

@@ -1,4 +1,4 @@
-hnbap_HEADERS = \
+noinst_HEADERS = \
 	AccessResult.h \
 	Access-stratum-release-indicator.h \
 	AdditionalNeighbourInfoList.h \
@@ -114,5 +114,3 @@ hnbap_HEADERS = \
 	U-RNTIQueryRequest.h \
 	U-RNTIQueryResponse.h \
 	UTRANCellID.h
-
-hnbapdir = $(includedir)/osmocom/osmo-iuh/hnbap

include/osmocom/rua/Makefile.am

@@ -1,4 +1,4 @@
-rua_HEADERS = \
+noinst_HEADERS = \
 	RUA_Ansi-41-IDNNS.h \
 	RUA_Cause.h \
 	RUA_CauseMisc.h \
@@ -34,6 +34,3 @@ rua_HEADERS = \
 	RUA_TriggeringMessage.h \
 	RUA_TypeOfError.h \
 	RUA_UnsuccessfulOutcome.h
-
-ruadir = $(includedir)/osmocom/osmo-iuh/rua
-