Move declaration of keymap_config.

Should really not declare variables in .h files - since it's included
in different .c files, a proper linker then complains that the same
variable is declared more than once (once for each .c file that the
offending .h is included in).

tmk_core/common/bootmagic.c

@@ -10,6 +10,7 @@
 #include "eeconfig.h"
 #include "bootmagic.h"
 
+keymap_config_t keymap_config;
 
 void bootmagic(void)
 {

tmk_core/common/keymap.c

@@ -24,6 +24,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "debug.h"
 #include "bootloader.h"
 
+#ifdef BOOTMAGIC_ENABLE
+extern keymap_config_t keymap_config;
+#endif
 
 static action_t keycode_to_action(uint8_t keycode);
 

tmk_core/common/keymap.h

@@ -38,7 +38,6 @@ typedef union {
         bool nkro:1;
     };
 } keymap_config_t;
-keymap_config_t keymap_config;
 #endif