cmake: remove unnecessary check for strerror()
cmake: remove unnecessary check for strerror()

There is no replacement for strerror currently. If this check
failed, nothing would be done anyway.

git-svn-id: d023f1085a36f7a677188d00334e37d38ffecf51@990 64e312b2-a51f-0410-8e61-82d0ca0eb02a

brarcher/check,9fcc/check,libcheck/check,krichter722/check,9fcc/check,krichter722/check,krichter722/check,brarcher/check,libcheck/check,libcheck/check,9fcc/check,krichter722/check,9fcc/check,libcheck/check,9fcc/check,brarcher/check,brarcher/check,libcheck/check,krichter722/check,brarcher/check