[PATCH] Turn implict-function-declaration warnings into errors

[Florian Weimer]

GCC 4.4, the minimum compiler version, supports this option.  Unlike
other warnings, -Wimplicit-function-declaration warnings should be
independent of compiler versions, so this change should not cause
compiler-specific build failures (the usual trouble with -Werror).

Testing this change revealed one missing #include file in a test case.

-- 
Florian Weimer / Red Hat Product Security
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