rename semaphore.* -> ra_semaphore.* to avoid semaphore.h being used by the rpi video driver includes instead of the system semaphore.h - fixes #2304

Makefile.common

@@ -868,7 +868,7 @@ ifeq ($(HAVE_NETWORKING), 1)
    ifeq ($(HAVE_CHEEVOS), 1)
       ifeq ($(HAVE_THREADS), 1)
          DEFINES += -DHAVE_CHEEVOS
-         OBJ += cheevos.o semaphore.o async_job.o libretro-common/utils/md5.o
+         OBJ += cheevos.o ra_semaphore.o async_job.o libretro-common/utils/md5.o
       endif
    endif
 endif

async_job.c

@@ -16,7 +16,7 @@
 #include <stdlib.h>
 
 #include <rthreads/rthreads.h>
-#include <semaphore.h>
+#include <ra_semaphore.h>
 #include <async_job.h>
 
 typedef struct async_job_node async_job_node_t;

griffin/griffin.c

@@ -90,7 +90,7 @@ ACHIEVEMENTS
 #include "../libretro-common/formats/json/jsonsax.c"
 #include "../libretro-common/utils/md5.c"
 #include "../net_http_special.c"
-#include "../semaphore.c"
+#include "../ra_semaphore.c"
 #include "../async_job.c"
 #include "../cheevos.c"
 #endif

ra_semaphore.c

@@ -27,7 +27,7 @@
 #include <stdlib.h>
 
 #include <rthreads/rthreads.h>
-#include <semaphore.h>
+#include <ra_semaphore.h>
 
 struct ssem
 {