[NFC][compiler-rt][profile] Remove non-Posix -h option from test

We are running `ls -lh` in gcov-execlp.c test in Posix folder.
However `-h` is not a POSIX option,ls on some POSIX system (eg: AIX)
may not support it.

This patch remove this option to avoid break.

Reviewed By: anhtuyen

Differential Revision: https://reviews.llvm.org/D111807