Save location information of symbol definitions

Now, object files save the file name and line number where each global
symbol is defined.

Signed-off-by: Antonio Niño Díaz <antonio_nd@outlook.com>

include/asm/fstack.h

@@ -41,6 +41,8 @@ extern void fstk_RunRept(ULONG count);
 FILE *
 fstk_FindFile(char *);
 
+int fstk_GetLine(void);
+
 extern int yywrap(void);
 
 #endif