lib/drmtest.h : fix mmap64 again
lib/drmtest.h : fix mmap64 again

In android mmap64 was redirected to mmap2 because mmap64
was not alway available. But now mmap2 has been removed
from 64 bit android builds (and mmap64 is available), so
update preprocessor conditional to check for __x86_64__.

Signed-off-by: Tim Gore <574638b6c8be9618c62b9975be7a73fefbc6d4f1@intel.com>
Signed-off-by: Thomas Wood <b9025d6a953b68f894a0f6a80fd2af6d55b0badd@intel.com>

tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools,dlespiau/checkmate-test-igt,dlespiau/checkmate-test-igt,tiagovignatti/intel-gpu-tools,mv0/intel-gpu-tools,chenxianqin/intel-gpu-tools,mv0/intel-gpu-tools,chenxianqin/intel-gpu-tools,chenxianqin/intel-gpu-tools,tiagovignatti/intel-gpu-tools,mv0/intel-gpu-tools,dlespiau/checkmate-test-igt,chenxianqin/intel-gpu-tools,dlespiau/checkmate-test-igt,mv0/intel-gpu-tools