Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Fix some non-standard variable declarations.

Eliminate some warnings.

Cosmetic changes only:
- style
- remove unused variables
- de-support VAX

Inspired by: bin/42388

Remove some kludges designed to ensure that the compiler didn't round
constants the wrong way on the VAX. Instead, use C99 hexadecimal
floating-point constants, which are guaranteed to be exact on binary
IEEE machines. (The correct hexadecimal values were already provided
in the source, but not used.) Also, convert the constants to
lowercase to work around a gcc bug that wasn't fixed until gcc 3.4.0.

Prompted by: stefanf

Resurrect Lite1's gamma() as C99's tgamma(). Minimal changes.

Fix SCM ID's.

Add __FBSDID()s to libm

Remove trailing whitespace.

BSD 4.4 Lite Lib Sources