[fixed]WAL loader misses include guards

[hendu]

The WAL image loader misses the include guards (if it's not defined in IrrCompileConfig).

This causes longer compile times, and slightly bigger lib even when it's disabled in IrrCompileConfig (I measured 10kb).

Some other loaders may miss them too, but WAL with its big arrays caught my attention. Please add those guards for all loaders that miss them.

[hybrid]

Yeah, should be fixed in 1.7 branch now. Image writers still to be checked, though. Thanks for reporting.
Edit: Writers are all ok, so fixed.

[hendu]

I updated my 1.7 svn checkout, but it's not there. Not pushed to SF / SF having issues?

[hybrid]

Oh, sorry. Seems that I chose the wrong directory, so it's only in trunk. Sorry for the confusion.