Make list of linker symbols common

That way the definitions of the assembler and the linker are always the
same.

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

src/asm/asmy.y

@@ -12,12 +12,13 @@
 #include "asm/fstack.h"
 #include "asm/lexer.h"
 #include "asm/main.h"
-#include "asm/mylink.h"
 #include "asm/mymath.h"
 #include "asm/output.h"
 #include "asm/rpn.h"
 #include "asm/symbol.h"
 
+#include "linkdefs.h"
+
 char *tzNewMacro;
 uint32_t ulNewMacroSize;