Right usage of linking. Enable the reuse of the same Slang object across multiple input files.

Change-Id: Id036c300ece9a245437ea2bdd0a9c0da436f558d
diff --git a/libslang.h b/libslang.h
index 7f7d0e9..20a694e 100644
--- a/libslang.h
+++ b/libslang.h
@@ -40,6 +40,8 @@
 const char* slangGetInfoLog(SlangCompiler* compiler);
 void slangGetPragmas(SlangCompiler* compiler, size_t* actualStringCount, size_t maxStringCount, char** strings);
 
+const char* slangExportFuncs(SlangCompiler* compiler);
+
 void slangReset(SlangCompiler* compiler);
 
 #ifdef __cplusplus