Fixed a few warnings.

Rev: src/fdlib.c:1.41
Rev: src/fdlib.h:1.36
Rev: src/modules/Image/colortable.c:1.96
Rev: src/modules/Image/poly.c:1.10
Rev: src/modules/Image/polyfill.c:1.35
Rev: src/modules/Image/search.c:1.18
Rev: src/modules/MIME/mime.c:1.26
Rev: src/modules/files/efuns.c:1.84