bpo-24916: Remove an outdated comment. (GH-19101)

Lib/sysconfig.py

@@ -84,8 +84,6 @@ _INSTALL_SCHEMES = {
 _SCHEME_KEYS = ('stdlib', 'platstdlib', 'purelib', 'platlib', 'include',
                 'scripts', 'data')
 
- # FIXME don't rely on sys.version here, its format is an implementation detail
- # of CPython, use sys.version_info or sys.hexversion
 _PY_VERSION = sys.version.split()[0]
 _PY_VERSION_SHORT = '%d.%d' % sys.version_info[:2]
 _PY_VERSION_SHORT_NO_DOT = '%d%d' % sys.version_info[:2]