Revert 5533, removing the misleading TODO and commenting it properly.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5534 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/Common/Src/LinearDiskCache.cpp

@@ -16,10 +16,13 @@
 // http://code.google.com/p/dolphin-emu/
 
 #include "LinearDiskCache.h"
-#include "svnrev.h"
 
 static const char ID[4] = {'D', 'C', 'A', 'C'};
-const int version = SVN_REV;
+
+// Update this to the current SVN revision every time you change shader generation code.
+// We don't automatically get this from SVN_REV because that would mean regenerating the
+// shader cache for every revision, graphics-related or not, which is simply annoying.
+const int version = 5520;
 
 LinearDiskCache::LinearDiskCache() 
 	: file_(NULL), num_entries_(0) {