Revert "Added default precision qualifier in fragment shaders"

This reverts commit c23da9e855.

src/graphics/shader.cpp

@@ -65,11 +65,6 @@ GLuint ShaderBase::loadShader(const std::string &file, unsigned type)
     
     std::ostringstream code;
     code << "#version " << CVS->getGLSLVersion()<<"\n";
-    
-    //shader compilation fails with some drivers if there is no precision qualifier
-    if (type == GL_FRAGMENT_SHADER)
-        code << "precision mediump float;\n";
-        
     if (CVS->isAMDVertexShaderLayerUsable())
         code << "#extension GL_AMD_vertex_shader_layer : enable\n";
     if (CVS->isAZDOEnabled())