tests/amd64/stat/Makefile: Refactored to use some variables.
tests/amd64/stat/Makefile: Refactored to use some variables.

SumiTomohiko/fsyscall2,SumiTomohiko/fsyscall2,SumiTomohiko/fsyscall2,SumiTomohiko/fsyscall2,SumiTomohiko/fsyscall2