[BlackBerry] MathExtras: macros defined in math.h conflict with the real functions
https://bugs.webkit.org/show_bug.cgi?id=112683

Patch by Alberto Garcia <agarcia@igalia.com> on 2013-04-08
Reviewed by Darin Adler.

After calls to signbit and friends were prefixed with std:: in
r143232, the BlackBerry port no longer compiles.

The solution is to get rid of the macros defined in math.h and use
the real functions instead.

* wtf/MathExtras.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147972 268f45cc-cd09-0410-ab3c-d52691b4dbfc