win: libm: add implementation for round/fmin/fmax and variants
win: libm: add implementation for round/fmin/fmax and variants

round and fmin/fmax are relatively commonly used functions but were not
implemented anywhere in the tcc Windows distribution package. Newer mingw(64)
math.h stil doesn't include these implementations.

Add C implementations for these functions and place it as inline functions at
win32/include/tcc/tcc_libm.h - which is already included from math.h .

The code is mostly taken from musl-libc rs-1.0 (MIT) [*],

musl-libc: http://git.musl-libc.org/cgit/musl/tree/src/math?h=rs-1.0
license:   http://git.musl-libc.org/cgit/musl/tree/COPYRIGHT?h=rs-1.0

Potential enhancements:
- Check how many useful libm implementations are still missing and consider
  adding them (some of them already work via the MS runtime).
- Consider putting libm implementations in an actual libm.a file, or add a dummy
  one such that build processes which try to link with libm will not fail.

avih/tinycc,run4flat/tinycc,andrewchambers/tccmirror,mingodad/tinycc,andrewchambers/tccmirror,mirror/tinycc,run4flat/tinycc,metaeducation/tcc,avih/tinycc,mirror/tinycc,seyko2/tinycc,andreiw/tinycc,metaeducation/tcc,run4flat/tinycc,mirror/tinycc,code4game/tinycc,mingodad/tinycc,code4game/tinycc,andreiw/tinycc,andreiw/tinycc,metaeducation/tcc,mingodad/tinycc,seyko2/tinycc,metaeducation/tcc,avih/tinycc,avih/tinycc,andrewchambers/tccmirror,andrewchambers/tccmirror,metaeducation/tcc,run4flat/tinycc,seyko2/tinycc,mingodad/tinycc,mirror/tinycc,code4game/tinycc,seyko2/tinycc,run4flat/tinycc,andrewchambers/tccmirror,seyko2/tinycc