Fix SkFlate.cpp when SK_ZLIB_INCLUDE is not #defined.
Fix SkFlate.cpp when SK_ZLIB_INCLUDE is not #defined.

This was failing for Windows builds since r1911.

git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@1923 2bbb7eff-a529-9590-31e7-b0007b416f81

metajack/skia,mrobinson/skia,mrobinson/skia,Cue/skia,Cue/skia,Cue/skia,Cue/skia,metajack/skia,metajack/skia,mrobinson/skia,metajack/skia,mrobinson/skia,mrobinson/skia