[sr #110532] AC_CHECK_LIB no longer works with a C++ compiler

Follow-up Comment #2, sr #110532 (project autoconf):

MPFR is written in C, and it is generally compiled with a C compiler, so that
we expect the compiler to be given by $CC. This means that we need AC_LANG(C),
not AC_LANG(C++).

But we also allow C++ compilers (some compilers seem to support only C++, and
testing with a C++ compiler also allows us to detect some issues with the
header files). And since the compiler is given by $CC, g++ (for instance) is
used via CC=g++.

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