MinGW headers are all lowercase, and because we build FF with MinGW
on Linux - capitalization matters. But if you're plugging along,
working on Windows, you might forget about that, and wind up
inadvertently breaking the MinGW build because you capitalized
an include file (as is common in Windows development.)
This lint job takes the list of header files from MinGW
(generated by cd mingw-w64/mingw-w64-headers &&
find . -name "*.h" | xargs -I bob -- basename bob | sort | uniq)
and will alert if they are in an #include statement but not
all-lowercase.
MozReview-Commit-ID: 4QFSdHx5Uak
38239c717a