Global: don't use __has_include

It reports false results in ubuntu 20.04. Details unknown.

src/detection/camera/camera_linux.c

@@ -5,13 +5,13 @@
 #include <fcntl.h>
 #include <sys/ioctl.h>
 
-#if __has_include(<linux/videodev2.h>)
+#if FF_HAVE_LINUX_VIDEODEV2
     #include <linux/videodev2.h>
 #endif
 
 const char* ffDetectCamera(FFlist* result)
 {
-#if __has_include(<linux/videodev2.h>)
+#if FF_HAVE_LINUX_VIDEODEV2
     char path[] = "/dev/videoN";
 
     for (uint32_t i = 0; i <= 9; ++i)

src/detection/gpu/gpu_linux.c

@@ -7,29 +7,23 @@
 #include "common/properties.h"
 #include "util/stringUtils.h"
 
-#define FF_STR_INDIR(x) #x
-#define FF_STR(x) FF_STR_INDIR(x)
-
 #include <inttypes.h>
 
-#if __has_include(<drm/drm.h>)
-    #include <drm/drm.h>
-    #define FF_HAVE_DRM_H 1
-#elif __has_include(<libdrm/drm.h>)
-    #include <libdrm/drm.h>
-    #define FF_HAVE_DRM_H 1
-#endif
-
-#if FF_HAVE_DRM_H
-    #include <fcntl.h>
-    #include <sys/ioctl.h>
-
-    #if __aarch64__ && __has_include(<drm/asahi_drm.h>)
-        #include <drm/asahi_drm.h>
+#if __aarch64__
+    #if __has_include(<asahi_drm.h>)
+        #include <asahi_drm.h>
+        #include <drm.h>
+        #include <fcntl.h>
+        #include <sys/ioctl.h>
         #define FF_HAVE_ASAHI_DRM_H 1
+    #else
+        #warning "<asahi_drm.h> not available"
     #endif
 #endif
 
+#define FF_STR_INDIR(x) #x
+#define FF_STR(x) FF_STR_INDIR(x)
+
 static bool pciDetectDriver(FFGPUResult* gpu, FFstrbuf* pciDir, FFstrbuf* buffer, FF_MAYBE_UNUSED const char* drmKey)
 {
     uint32_t pciDirLength = pciDir->length;

src/detection/users/users_linux.c

@@ -1,7 +1,7 @@
 #include "fastfetch.h"
 #include "users.h"
 
-#if __has_include(<utmpx.h>)
+#if FF_HAVE_UTMPX
     #include <utmpx.h>
 #else
     //for Android compatibility

src/detection/wifi/wifi_linux.c

@@ -212,7 +212,7 @@ static const char* detectWifiWithLibnm(FFlist* result)
 
 #endif
 
-#if __has_include(<linux/wireless.h>)
+#if FF_HAVE_LINUX_WIRELESS
 #define FF_DETECT_WIFI_WITH_IOCTLS
 
 #include "common/io/io.h"