PixelShaderGen: Move defines into the implementation file

These aren't used outside of it. This also reduces the amount of things in
the global namespace.

Source/Core/VideoCommon/PixelShaderGen.cpp

@@ -18,6 +18,24 @@
 #include "VideoCommon/VideoConfig.h"
 #include "VideoCommon/XFMemory.h"  // for texture projection mode
 
+// TODO: Get rid of these
+enum : u32
+{
+	C_COLORMATRIX   = 0,                 //  0
+	C_COLORS        = 0,                 //  0
+	C_KCOLORS       = C_COLORS + 4,      //  4
+	C_ALPHA         = C_KCOLORS + 4,     //  8
+	C_TEXDIMS       = C_ALPHA + 1,       //  9
+	C_ZBIAS         = C_TEXDIMS + 8,     // 17
+	C_INDTEXSCALE   = C_ZBIAS + 2,       // 19
+	C_INDTEXMTX     = C_INDTEXSCALE + 2, // 21
+	C_FOGCOLOR      = C_INDTEXMTX + 6,   // 27
+	C_FOGI          = C_FOGCOLOR + 1,    // 28
+	C_FOGF          = C_FOGI + 1,        // 29
+	C_ZSLOPE        = C_FOGF + 2,        // 31
+	C_EFBSCALE      = C_ZSLOPE + 1,      // 32
+	C_PENVCONST_END = C_EFBSCALE + 1
+};
 
 static const char *tevKSelTableC[] =
 {