#260 Win-Cygwin Warnings + Patch

[Max Funk]

During Cygwin compilation (see previous issue #3399941) ,
I get mainly three warnings:
1) UINT_64 already defined
2) wchar_t: Comparison always true due to limited range of data type
3) "CELVEC" is not defined.

My little patch removes 1) and 2).
As for 3), perhaps one could change #if CELVEC into #ifdef CELVEC,
but I didn't know its purpose...

[Max Funk]

win-cygwin warnings