#25 Fixes crash on x86_64

[Anonymous]

src-ILUT/src/ilut_opengl.c

Is missing an include statement which causes it to miss
a prototype for a function returning a pointer, which
makes the compiler default the return type
to int , which breaks on 64 bit where an int is 32 bit
and a pointer 64 bit.

Note: Patch actually created by Hans de Goede

[Nobody/Anonymous]

64bit crash fix

[Anonymous]

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I have fixed by placing the include in the "#ifdef linux" of
ilut_opengl.h