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/gsm/Makefile.am b/src/gsm/Makefile.am
index e64c9e7..d15174a 100644
--- a/src/gsm/Makefile.am
+++ b/src/gsm/Makefile.am
@@ -6,6 +6,10 @@
 AM_CPPFLAGS = -I$(top_srcdir)/include -I$(top_builddir)/include $(TALLOC_CFLAGS)
 AM_CFLAGS = -Wall ${GCC_FVISIBILITY_HIDDEN}
 
+if ENABLE_PSEUDOTALLOC
+AM_CPPFLAGS += -I$(top_srcdir)/src/pseudotalloc
+endif
+
 # FIXME: this should eventually go into a milenage/Makefile.am
 noinst_HEADERS = milenage/aes.h milenage/aes_i.h milenage/aes_wrap.h \
 		 milenage/common.h milenage/crypto.h milenage/includes.h \