Fix build warnings about unused private variables on clang

src/compiler/translator/VersionGLSL.cpp

@@ -36,8 +36,7 @@ static const int GLSL_VERSION_120 = 120;
 //    - varying vec3 color; invariant color;
 //
 TVersionGLSL::TVersionGLSL(ShShaderType type)
-    : mShaderType(type),
-      mVersion(GLSL_VERSION_110)
+    : mVersion(GLSL_VERSION_110)
 {
 }
 

src/compiler/translator/VersionGLSL.h

@@ -49,7 +49,6 @@ protected:
     void updateVersion(int version);
 
 private:
-    ShShaderType mShaderType;
     int mVersion;
 };