[PATCH v2] msvcrt: Implement strtod without using 'long double'.

[Erich E. Hoover]

v2: Fix test results on 32-bit Debian *sigh*

Fixes the "regression" with cl.exe caused by
0e183cc3c0d3b6f89f79047cdd71c389afc75073.
( https://bugs.winehq.org/show_bug.cgi?id=48160 )

Best,
Erich