When building the 'xdev' target when WITH_GCC=1 and
WITHOUT_CLANG_IS_CC=1, it appears WITHOUT_CLANG=1 must
also be set.

While here, reorder the lines to put the WITH_* and
WITHOUT_* entries on the same line.

MFC After:	3 days
X-MFC-With:	r264518
Tested on:	stable/10@r264677
Sponsored by:	The FreeBSD Foundation
Fix EOL escape.

MFC after:	3 days
X-MFC-With:	r264697
Sponsored by:	The FreeBSD Foundation