libfreeimage: correct 0005-Manage-powf64-with-glibc.patch line endings

Fixes:
http://autobuild.buildroot.net/results/131/131f97d2c3525794163e5c7863bb8b8523fb05ba/



The libfreeimage source code uses DOS line endings, which gets stripped by
patchwork so the patch no longer applies.  Fix it by converting line endings
of the patch hunks to DOS (but not the patch meta data).

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>