When cross-compiling for Windows on a Linux system, the filesystem is case sensitive and so #includes with uppercase characters cause errors. Change-Id: I6fe6d677887ce84ba8b2c3136cf2c70998d96e81 Reviewed-on: https://boringssl-review.googlesource.com/5060 Reviewed-by: David Benjamin <davidben@chromium.org> Reviewed-by: Adam Langley <agl@google.com>