Changes posmtx vertex attribute to integer.

This makes it so we don't need to do some dumb casting from float to integer in our shaders.
Only tested in OpenGL, needs to be tested in D3D.

Source/Core/VideoBackends/OGL/ProgramShaderCache.cpp

@@ -102,7 +102,7 @@ void SHADER::SetProgramBindings()
 	// Need to set some attribute locations
 	glBindAttribLocation(glprogid, SHADER_POSITION_ATTRIB, "rawpos");
 
-	glBindAttribLocation(glprogid, SHADER_POSMTX_ATTRIB,   "fposmtx");
+	glBindAttribLocation(glprogid, SHADER_POSMTX_ATTRIB,   "posmtx");
 
 	glBindAttribLocation(glprogid, SHADER_COLOR0_ATTRIB,   "color0");
 	glBindAttribLocation(glprogid, SHADER_COLOR1_ATTRIB,   "color1");