RxMath functions do not honor precision on Windows

On Windows the RxMath functions do not honor the precision argument, of the current setting of numeric digits.

This was reported on RexxLA by John Gallucci and confirmed by Alan Sampson. Alan provided a nice test program:

Rexx 'version' information:
REXX-ooRexx_3.1(MT) 6.00 17 Nov 2006

Call mathematical functions with default settings:

Numeric Digits: 9
Form : SCIENTIFIC
Fuzz : 0

Default: 0.707107
2: 0.707107
6: 0.707107
9: 0.707107
16: 0.707107

Call mathematical functions with numeric digits set to 6:

Numeric Digits: 6
Form : SCIENTIFIC
Fuzz : 0

Default: 0.707107
2: 0.707107
6: 0.707107
9: 0.707107
16: 0.707107