[tnozaki-elftoolchain] TNF local patch for libelf - tools build failure on Mac OS X due to missing roundup2()

Issue #280 resolved
Takehiko NOZAKI repo owner created an issue

original commit: http://cvsweb.netbsd.org/bsdweb.cgi/src/external/bsd/libelf/dist/Attic/_libelf.h#rev1.5

DTrace: Get DTrace to build on OS X platforms.