Various compilation fixes for avr-gcc 10 (#9269)

keyboards/omnikeyish/dynamic_macro.c

@@ -1,6 +1,8 @@
 #include QMK_KEYBOARD_H
 #include <string.h>
 
+dynamic_macro_t dynamic_macros[DYNAMIC_MACRO_COUNT];
+
 void dynamic_macro_init(void) {
   /* zero out macro blocks  */
   memset(&dynamic_macros, 0, DYNAMIC_MACRO_COUNT * sizeof(dynamic_macro_t));

keyboards/omnikeyish/dynamic_macro.h

@@ -71,8 +71,6 @@ typedef struct {
   uint16_t    checksum;
 } dynamic_macro_t;
 
-dynamic_macro_t dynamic_macros[DYNAMIC_MACRO_COUNT];
-
 void     dynamic_macro_init(void);
 void     dynamic_macro_led_blink(void);
 void     dynamic_macro_record_start(uint8_t macro_id);