Remove obsolete MSVC check from pragma guard

 git grep -h -B1 "^#\s*pragma once" | grep -v pragma | sort | uniq

is now clean.

[SVN r85952]
Functional: Remove obsolete MSVC version checks.

[SVN r86051]
Functional: Remove obsolete GCC version checks.

[SVN r86112]
Simplify SFINAE for largest float overload. Refs #8822.

I accidentally missed it out. Also fix the return values.

[SVN r86172]
Change log.

[SVN r86173]
Remove BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

Process #ifdef...#endif blocks.

[SVN r86243]
Remove BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

Process #ifndef...#else...#endif blocks.

[SVN r86245]