add libpseudotalloc as super-simplistic talloc replacement

In tightly embedded builds (--enable-embedded), we want the ability to
replace talloc with a very simple heap allocator to avoid the complexity
of talloc without modifying all our code that assumes talloc.

This will break the hierarchical notion of the allocator, but
libosmo{core,gsm,coding,codec} don't rely on that anyway.

Change-Id: Ie341034076f242a813f081919dd09d845775ad35
diff --git a/src/coding/Makefile.am b/src/coding/Makefile.am
index cbdcf47..06e55e5 100644
--- a/src/coding/Makefile.am
+++ b/src/coding/Makefile.am
@@ -9,6 +9,10 @@
 	$(TALLOC_CFLAGS)
 AM_CFLAGS = -Wall
 
+if ENABLE_PSEUDOTALLOC
+AM_CPPFLAGS += -I$(top_srcdir)/src/pseudotalloc
+endif
+
 lib_LTLIBRARIES = libosmocoding.la
 
 libosmocoding_la_SOURCES = \