[Tinycc-devel] configure: test arbitrary compiler preprocessor conditions

[avihpit]

This patch adds `ppif` function at `configure` which can test arbitrary
compiler preprocessor condition even when cross compiling.

Currently it's only used to detect x86-64 and i386 CPUs, but hopefully
it will be used to replace some config guesses or uname-related tests.

If there are no objections, I'll push it to mob soon.

0001-configure-allow-cc-tests-even-if-cross-compiling-tes.patch
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