fixup (partial revert): "coding: clean up Makefile.am"

This is a partial revert of "9dca9027 coding: clean up Makefile.am".

Even though libosmocoding does not use talloc API, it still depends on
this library indirectly via libosmo{core,codec,gsm}.  Furthermore, some
of libosmocore's header files do #include <osmocom/core/talloc.h>, and
thus #include <talloc.h> via this internal header.

Under Slackware 14.2 talloc.h header lives in /usr/include/samba-4.0,
and without $(TALLOC_CFLAGS) compilation of libmsocoding fails due
to the preprocessor failing to find this header.  The culprit is my
recent patch 9dca9027 removing $(TALLOC_CFLAGS) and $(TALLOC_LIBS).

Put $(TALLOC_CFLAGS) back to AM_CFLAGS;  it will likely be emply under
distributions having talloc.h header in the standard include dir.  The
$(TALLOC_LIBS) does not need to be resurrected because libtool will
add '-ltalloc' automatically for each libosmo*.la in LIBADD.

Change-Id: Ic1bd82159a827af21fe36bea998f8f58f732473a
Related: OS#5960
---
M src/coding/Makefile.am
1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/src/coding/Makefile.am b/src/coding/Makefile.am
index bb7bde2..987e073 100644
--- a/src/coding/Makefile.am
+++ b/src/coding/Makefile.am
@@ -8,7 +8,7 @@
 	-I"$(top_builddir)/include" \
 	-I"$(top_builddir)" \
 	$(NULL)
-AM_CFLAGS = -Wall
+AM_CFLAGS = -Wall $(TALLOC_CFLAGS)
 
 if ENABLE_PSEUDOTALLOC
 AM_CPPFLAGS += -I$(top_srcdir)/src/pseudotalloc

