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The ntpd package ships autoconf macros which attempt to test for the C99 compliance of `snprintf()` and `vsnprintf()`. Those macros unconditionally consider the functions not compliant in a cross compile setting and therfore break all subsequent configure tests because the `snprintf` and `vsnprintf` symbols are shadowed with `#define` directives redirecting them to their respectiv gnulib replacements. The fortify source headers in turn will `#undef` those defines when wrapping the associated functions and therfore cause all `conftest` programs to emit a failure. Pass the required magic autoconf cache variables via `CONFIGURE_VARS` to let `./configure` assume C99 compliance of the affected functions, thus fixing the build. Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>