Add initializer of debug_config for GCC < 4.6.0(#144)

common/debug.c

@@ -4,12 +4,21 @@
 #define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
 
 debug_config_t debug_config = {
-#if GCC_VERSION >= 40600
 /* GCC Bug 10676 - Using unnamed fields in initializers
  * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=10676 */
+#if GCC_VERSION >= 40600
     .enable = false,
     .matrix = false,
     .keyboard = false,
     .mouse = false,
+    .reserved = 0
+#else
+    {
+        false,  // .enable
+        false,  // .matrix
+        false,  // .keyboard
+        false,  // .mouse
+        0       // .reserved
+    }
 #endif
 };

common/debug_config.h

@@ -27,7 +27,6 @@ extern "C" {
 
 /* NOTE: Not portable. Bit field order depends on implementation */
 typedef union {
-    uint8_t raw;
     struct {
         bool enable:1;
         bool matrix:1;
@@ -35,6 +34,7 @@ typedef union {
         bool mouse:1;
         uint8_t reserved:4;
     };
+    uint8_t raw;
 } debug_config_t;
 extern debug_config_t debug_config;