Gabriel F. T. Gomes bd51ff5ed0 Add tests for the long double version of ecvt and fcvt
The test case misc/tst-efgcvt.c only tests the double variants of the
Old-fashioned System V number-to-string functions: ecvt, fcvt, and their
re-entrant counterparts.  With a few macros, the code can be reused for
the long double versions of these functions.  A future patch will reuse
it again for IEEE long double on powerpc64le.

Tested for powerpc and powerpc64le.
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