fix: undef _FORTIFY_SOURCE before setting #270
Merged
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Build failed on (macos-12, clang-15, release, developer_mode (warnings_as_errors)) because of
After some research, I noticed both this guide and firefox recommend/use
-U_FORTIFY_SOURCE
before-D_FORTIFY_SOURCE=3
to avoid this problem, So I suggest to fix this issue in this way.