fix build

[ 33%] Building CXX object test/multi/CMakeFiles/test_fib.dir/fib.cpp.o
/home/op/work/ukatemi/libcpu/test/multi/fib.cpp:6:10: fatal error: 'cinttypes' file not found
 #include <cinttypes>
         ^
1 error generated.
*** [test/multi/CMakeFiles/test_fib.dir/fib.cpp.o] Error code 1

Stop in /usr/home/op/work/ukatemi/libcpu.
*** [test/multi/CMakeFiles/test_fib.dir/all] Error code 1