[PATCH 1/3 v2] msvcrt: Import exp2f implementation from musl.

[Piotr Caban]

Signed-off-by: Piotr Caban 
---
v2:
  - add ULL suffix to UINT64 constants

configure.ac          |  3 +--
  dlls/msvcrt/math.c    | 58 ++++++++++++++++++++++++++++++++++++++++---
  dlls/msvcrt/unixlib.c | 13 ----------
  dlls/msvcrt/unixlib.h |  1 -
  4 files changed, 56 insertions(+), 19 deletions(-)