fixes for compiling with gcc 10

gcc 10 no longer lets you get away with not externing global variables in header files. This adds the necessary extern and adds defines in appropriate c files

bootloader/storage/emummc.c

@@ -29,6 +29,8 @@
 #include "../utils/types.h"
 
 extern hekate_config h_cfg;
+emummc_cfg_t emu_cfg;
+
 
 void emummc_load_cfg()
 {

bootloader/storage/emummc.h

@@ -47,7 +47,7 @@ typedef struct _emummc_cfg_t
 	int fs_ver;
 } emummc_cfg_t;
 
-emummc_cfg_t emu_cfg;
+extern emummc_cfg_t emu_cfg;
 
 void emummc_load_cfg();
 bool emummc_set_path(char *path);

bootloader/storage/nx_sd.c

@@ -25,6 +25,11 @@
 static bool sd_mounted = false;
 static u32  sd_mode = SD_UHS_SDR82;
 
+
+sdmmc_t sd_sdmmc;
+sdmmc_storage_t sd_storage;
+FATFS sd_fs;
+
 u32 sd_get_mode()
 {
 	return sd_mode;

bootloader/storage/nx_sd.h

@@ -30,9 +30,9 @@ enum
 	SD_UHS_SDR82  = 3,
 };
 
-sdmmc_t sd_sdmmc;
-sdmmc_storage_t sd_storage;
-FATFS sd_fs;
+extern sdmmc_t sd_sdmmc;
+extern sdmmc_storage_t sd_storage;
+extern FATFS sd_fs;
 
 u32  sd_get_mode();
 int  sd_init_retry(bool power_cycle);

bootloader/storage/sdmmc.h

@@ -21,7 +21,7 @@
 #include "../utils/types.h"
 #include "sdmmc_driver.h"
 
-u32 sd_power_cycle_time_start;
+extern u32 sd_power_cycle_time_start;
 
 typedef enum _sdmmc_type
 {

bootloader/storage/sdmmc_driver.c

@@ -32,6 +32,8 @@
 //#define DPRINTF(...) gfx_printf(__VA_ARGS__)
 #define DPRINTF(...)
 
+u32 sd_power_cycle_time_start;
+
 /*! SCMMC controller base addresses. */
 static const u32 _sdmmc_bases[4] = {
 	0x700B0000,