libgail-util: Split out sources listings

We want to share the listings with other non-autotools build systems.

libgail-util/Makefile.am

@@ -1,4 +1,5 @@
 include $(top_srcdir)/Makefile.decl
+include libgail-util-sources.inc
 
 EXTRA_DIST += \
 	gailutil.def \
@@ -35,17 +36,8 @@ endif
 
 lib_LTLIBRARIES = libgailutil-3.la
 
-util_c_sources =		\
-	gailmisc.c		\
-	gailtextutil.c
-
 libgailutilincludedir=$(includedir)/gail-3.0/libgail-util
 
-util_public_h_sources =		\
-	gailmisc.h		\
-	gailtextutil.h		\
-	gail-util.h
-
 libgailutil_3_la_SOURCES = 	\
 	$(util_c_sources)
 

libgail-util/libgail-util-sources.inc

@@ -0,0 +1,10 @@
+# Source listings for libgail-util
+
+util_c_sources =		\
+	gailmisc.c		\
+	gailtextutil.c
+
+util_public_h_sources =		\
+	gailmisc.h		\
+	gailtextutil.h		\
+	gail-util.h