Put static variable of config_gram.y into context structure

src/config_gram.y

@@ -51,7 +51,7 @@ static int assign_pin_list(int invert);
 static int which_opcode(TOKEN * opcode);
 static int parse_cmdbits(OPCODE * op, int opnum);
 
-static int pin_name;
+#define pin_name (cx->cfgy_pin_name)
 %}
 
 %token K_NULL;

src/libavrdude.h

@@ -1571,6 +1571,9 @@ typedef struct {
 
   // Static variable from dfu.c
   uint16_t dfu_wIndex;          // A running number for USB messages
+
+  // Static variable from config_gram.y
+ int cfgy_pin_name;             // Temporary variable for grammar parsing
 } cx_t;
 
 extern cx_t *cx;