FIX: Issue on PLATFORM_DRM

Author: raysan5

examples/shaders/resources/shaders/glsl100/raymarching.fs

@@ -1,9 +1,9 @@
 #version 100
 
-precision mediump float;
-
 #extension GL_OES_standard_derivatives : enable
 
+precision mediump float;
+
 // Input vertex attributes (from vertex shader)
 varying vec2 fragTexCoord;
 varying vec4 fragColor;