[PATCH] msvcrt: Improve string to double conversion accuracy.

[Marvin]

Hi,

While running your changed tests, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=70768

Your paranoid android.


=== debiant (32 bit report) ===

msvcr90:
msvcr90.c:1009: Test failed: got ret 4, expected ret 3, for 1d9999999999999999999

=== debiant (32 bit Chinese:China report) ===

msvcr90:
msvcr90.c:1009: Test failed: got ret 4, expected ret 3, for 1d9999999999999999999

=== debiant (32 bit WoW report) ===

msvcr90:
msvcr90.c:1009: Test failed: got ret 4, expected ret 3, for 1d9999999999999999999

=== debiant (64 bit WoW report) ===

msvcr90:
msvcr90.c:1009: Test failed: got ret 4, expected ret 3, for 1d9999999999999999999