Fix some formatting warnings.
Fix some type comparison warnings.
Don't even define the sse tex hash on non-sse.

Avoids unused func warnings.
Fix an uninitialized value warning.
Fix an unhandled case value warning.
Omit -Wno-psabi for clang.
Merge pull request #4666 from unknownbrackets/warnings

Minor warning fixes
Travis: Test Symbian.
Test