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.
diff --git a/include/osmocom/rua/Makefile.am b/include/osmocom/rua/Makefile.am
index 977a7bd..059dfb8 100644
--- a/include/osmocom/rua/Makefile.am
+++ b/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_TriggeringMessage.h \
RUA_TypeOfError.h \
RUA_UnsuccessfulOutcome.h
-
-ruadir = $(includedir)/osmocom/osmo-iuh/rua
-