JDK 8 code review request for 7075098: Remove unused fdlibm files

[Joe Darcy]

Hello.

Please review these straightforward changes for

    7075098: Remove unused fdlibm files
    http://cr.openjdk.java.net/~darcy/7075098.0/

The JDK math libraries in java.lang.{Math, StrictMath} do not expose all 
the functionality implemented in the embedded copy of FDLIBM (freely 
distributable math library).  Since we do not plan do expose the 
remaining functionality (erf, gamma, lgama, j0, j1, jn, acosh, asinh, 
etc.) and these functions are not needed by the Java core libs directly 
or by transitivity, this changeset removes the unneeded files from the 
build.

On my Linux build, with this change the size of the compiled fdlibm 
library file went down from 234,372 to 165,750 and all the math library 
regression tests pass.

Thanks,

-Joe