Cherry-pick upstream patch adding support for -idirafter [1] which
allows us to work around the issue of some distributions bundling the
icu headers with spidermonkey resulting in a conflict.
Further add support to our premake pkgconfig module to allow using this
feature and make use of it for when building with --with-system-mozjs.
[1] premake-core baf145dc388509c953a01bcd964835e2027208bf
Fixes: #5868
Signed-off-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>
Ralph Sennhauser
1f60a9b22d