Remove unneeded #if (#3301)

Co-authored-by: MichaelFiber <michael@cubeofb.org>

src/rcore.c

@@ -265,11 +265,9 @@
     #include <linux/input.h>            // Linux: Keycodes constants definition (KEY_A, ...)
     #include <linux/joystick.h>         // Linux: Joystick support library
 
-#if defined(PLATFORM_DRM)
     #include <gbm.h>                    // Generic Buffer Management (native platform for EGL on DRM)
     #include <xf86drm.h>                // Direct Rendering Manager user-level library interface
     #include <xf86drmMode.h>            // Direct Rendering Manager mode setting (KMS) interface
-#endif
 
     #include "EGL/egl.h"                // Native platform windowing system interface
     #include "EGL/eglext.h"             // EGL extensions