The make-system-wrappers.py invocation is largely identical to
make-stl-wrappers.py, though this script generates wrappers for both the
STL headers and every other system header that can be used.

Note that the nsprpub script didn't create multiple layers of
subdirectories properly, so for example the 'ia64/sys/inline.h' wrapper
is now generated properly. Additionally, MOZ_SYSTEM_ICU define was
incorrectly using '#ifdef' instead of '#if ... == 1', which causes those
unicode headers to have wrappers when they shouldn't. These will show up
as differences when comparing the Makefile output to the moz.build
output.

MozReview-Commit-ID: KvQAawfzXao

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extra : source : 5a967cc85e28e63c283a81e2c76444a76dfbd266