Support wrapping bootstrap CC for autotools

During the initial bootstrap phase, an old autotools project (gcc
4.7.4) is built and this potentially with a new compiler. For some
of the tests carried out by the autotools, the compiler is used
without the CFLAGS provided. Therefore, offer to wrap the compiler
with the given flags to avoid that the autotools draw incorrect
conclusions if the compile attempt fails for a different reason,
e.g., because implicit declarations are now considered errors by
default by modern C compilers.

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