buildflags.md: Mention optional -fcommon under compiler flags
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Related: #2005080
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@ -235,6 +235,8 @@ The general (architecture-independent) build flags are:
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* `-grecord-gcc-switches`: Include select GCC command line switches in
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the DWARF debugging information. This is useful for detecting the
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presence of certain build flags and general hardening coverage.
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* `-fcommon`: This optional flag is used to build legacy software
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which relies on C tentative definitions. It is disabled by default.
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For hardened builds (which are enabled by default, see above for how
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to disable them), the flag
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