move libs/stfu into the core, as it is not really a lib

src/mod/codecs/mod_silk/Makefile.am

@@ -6,7 +6,7 @@ SILK_BUILDDIR=$(switch_builddir)/libs/silk
 SILK_LA=$(SILK_BUILDDIR)/.libs/libSKP_SILK_SDK.la
 
 mod_LTLIBRARIES = mod_silk.la
-mod_silk_la_SOURCES  = mod_silk.c ../../../../libs/stfu/stfu.c
+mod_silk_la_SOURCES  = mod_silk.c
 mod_silk_la_CFLAGS   = $(AM_CFLAGS) -I$(SILK_DIR)/src  -I$(SILK_DIR)/interface
 mod_silk_la_LIBADD   = $(switch_builddir)/libfreeswitch.la $(SILK_LA)
 mod_silk_la_LDFLAGS  = -avoid-version -module -no-undefined -shared

src/mod/codecs/mod_silk/mod_silk.c

@@ -31,11 +31,6 @@
  */
 
 #include "switch.h"
-#ifndef WIN32
-#include "stfu.h"
-#else
-#include "../../../libs/stfu/stfu.h"
-#endif
 #include "SKP_Silk_SDK_API.h"
 
 SWITCH_MODULE_LOAD_FUNCTION(mod_silk_load);