Incorporate FreeBSD port patches (libretro#16221)

This commit imports a series of patches from the FreeBSD port of RetroArch to
improve build compatibility and address specific issues encountered in the
FreeBSD environment. These patches, sourced from the FreeBSD Ports collection
(https://cgit.freebsd.org/ports/tree/games/retroarch/files), have been adapted
and tested to ensure they integrate seamlessly with the current build process.

gfx/common/wayland_common.c

@@ -448,8 +448,13 @@ bool gfx_ctx_wl_get_metrics_common(void *data,
 static int create_shm_file(off_t size)
 {
    int fd, ret;
+#ifndef __FreeBSD__
    if ((fd = syscall(SYS_memfd_create, SPLASH_SHM_NAME,
                MFD_CLOEXEC | MFD_ALLOW_SEALING)) >= 0)
+#else
+   if ((fd = memfd_create(SPLASH_SHM_NAME,
+               MFD_CLOEXEC | MFD_ALLOW_SEALING)) >= 0)
+#endif
    {
       fcntl(fd, F_ADD_SEALS, F_SEAL_SHRINK);
 

input/input_keymaps.c

@@ -54,7 +54,7 @@
 #include "SDL.h"
 #endif
 
-#if defined(__linux__) || defined(HAVE_WAYLAND)
+#if defined(__linux__) || defined(HAVE_WAYLAND) || defined(__FreeBSD__) && !defined(__PS4__)
 #if defined(__linux__)
 #include <linux/input.h>
 #include <linux/kd.h>
@@ -1213,7 +1213,7 @@ const struct rarch_key_map rarch_key_map_x11[] = {
 };
 #endif
 
-#if defined(__linux__) || defined(HAVE_WAYLAND)
+#if defined(__linux__) || defined(HAVE_WAYLAND) || defined(__FreeBSD__) && !defined(__PS4__)
 /* Note: Only one input can be mapped to each
  * RETROK_* key. If several physical inputs
  * correspond to the same key, these inputs

libretro-common/features/features_cpu.c

@@ -45,7 +45,7 @@
 
 #if defined(_XBOX360)
 #include <PPCIntrinsics.h>
-#elif !defined(__MACH__) && (defined(__POWERPC__) || defined(__powerpc__) || defined(__ppc__) || defined(__PPC64__) || defined(__powerpc64__))
+#elif !defined(__MACH__) && !defined(__FreeBSD__) && (defined(__POWERPC__) || defined(__powerpc__) || defined(__ppc__) || defined(__PPC64__) || defined(__powerpc64__))
 #ifndef _PPU_INTRINSICS_H
 #include <ppu_intrinsics.h>
 #endif
@@ -174,7 +174,7 @@ retro_perf_tick_t cpu_features_get_perf_counter(void)
    time_ticks = (1000000 * tv_sec + tv_usec);
 #elif defined(GEKKO)
    time_ticks = gettime();
-#elif !defined(__MACH__) && (defined(_XBOX360) || defined(__powerpc__) || defined(__ppc__) || defined(__POWERPC__) || defined(__PSL1GHT__) || defined(__PPC64__) || defined(__powerpc64__))
+#elif !defined(__MACH__) && !defined(__FreeBSD__) && (defined(_XBOX360) || defined(__powerpc__) || defined(__ppc__) || defined(__POWERPC__) || defined(__PSL1GHT__) || defined(__PPC64__) || defined(__powerpc64__))
    time_ticks = __mftb();
 #elif (defined(_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK > 0) || defined(__QNX__) || defined(ANDROID)
    struct timespec tv;