Summary:
strings.h header does not exist on Windows. So, we can try another way
to compare strings ignoring case.
Test Plan:
built and ran:
$ ./ldb_cmd_test
Reviewers: sdong, yhchiang, IslamAbdelRahman
Reviewed By: IslamAbdelRahman
Subscribers: andrewkr, dhruba, leveldb
Differential Revision: https://reviews.facebook.net/D56535