Added missing u_fogColor references.

src/gl/shaders/matfx_env.frag

@@ -9,6 +9,7 @@ float4 main(
 	uniform float2 u_alpharef,
 	uniform float4 u_colorClamp,
 	uniform float2 u_fxparams,
+	uniform float4 u_fogColor,
 	uniform sampler2D tex0 : TEXUNIT0,
 	uniform sampler2D tex1 : TEXUNIT1
 ) {

src/gl/shaders/matfx_gl3.inc

@@ -61,6 +61,7 @@ const char *matfx_env_frag_src =
 "	uniform float2 u_alpharef,\n"
 "	uniform float4 u_colorClamp,\n"
 "	uniform float2 u_fxparams,\n"
+"	uniform float4 u_fogColor,\n"
 "	uniform sampler2D tex0 : TEXUNIT0,\n"
 "	uniform sampler2D tex1 : TEXUNIT1\n"
 ") {\n"

src/gl/shaders/simple.frag

@@ -3,6 +3,7 @@ float4 main(
 	float2 v_tex0 : TEXCOORD0,
 	float v_fog : FOG,
 	uniform float2 u_alpharef,
+	uniform float4 u_fogColor,
 	uniform sampler2D tex0
 ) {
 	float4 color = v_color*tex2D(tex0, float2(v_tex0.x, 1.0-v_tex0.y));

src/gl/shaders/simple_fs_gl3.inc

@@ -4,6 +4,7 @@ const char *simple_frag_src =
 "	float2 v_tex0 : TEXCOORD0,\n"
 "	float v_fog : FOG,\n"
 "	uniform float2 u_alpharef,\n"
+"	uniform float4 u_fogColor,\n"
 "	uniform sampler2D tex0\n"
 ") {\n"
 "	float4 color = v_color*tex2D(tex0, float2(v_tex0.x, 1.0-v_tex0.y));\n"