78.4.0esr-based build is busted on Linux
17:59.53 /var/tmp/build/firefox-9633b5c7e832/security/sandbox/linux/SandboxFilter.cpp:247:36: error: use of undeclared identifier 'AT_EMPTY_PATH' 17:59.53 if (fd != AT_FDCWD && (flags & AT_EMPTY_PATH) != 0 && 17:59.53 ^
Wheezy comes with glibc 2.13 but
AT_EMPTY_PATH showed up in 2.14 first.
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