case-insensitive comparison of $*OS

the test assumes the p5 insanity of "linux" vs. "MSWin32", but the specs
are silent on the exact case of the return value. (And on the exact return
value itself, for that matter).

S02-magicals/config.t

@@ -21,12 +21,12 @@ ok $?OS, "We were compiled in '$?OS'";
 # $*OS is the OS we are running
 ok $*OS, "We are running under '$*OS'";
 
-my $osnames = any <darwin linux freebsd MSWin32 mingw msys cygwin browser solaris haiku openbsd>;
+my $osnames = lc any <darwin linux freebsd MSWin32 mingw msys cygwin browser solaris haiku openbsd>;
 
 #?rakudo skip 'unimpl $?OS'
-ok $?OS eq $osnames, "we know of the OS we were compiled in";
+ok $?OS.lc eq $osnames, "we know of the OS we were compiled in";
 
-ok $*OS eq $osnames, "we know of the OS we are running under";
+ok $*OS.lc eq $osnames, "we know of the OS we are running under";
 
 # like $*OS, this is tested in perlver.t but that test is not included
 ok $*OSVER, '$*OSVER is present';