Rémi Verschelde df7ecfc4a7 SCons: Expand env variables to check compiler version ...

Scons' `Environment.subst()` does that, and was already used in the
other place where we query an env variable (`env["LINK"]` in x11 code).

Fixes `3.2` iOS build after cherry-pick of #36559 (previously it only
ran for GCC code, not iOS's Clang), and the same issue would likely
affect `master` if iOS builds were enabled right now.

2020-03-04 14:36:58 +01:00

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