tests: remove IRIX support from tests also supported on Linux

Many tests claimed (via _supported_os) to work on both Linux and IRIX.
Since IRIX is no longer supported by xfstests, update these to claim
Linux support only.  Then remove any obvious IRIX-specific logic in the
tests, and any IRIX-specific golden output files.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

tests/generic/105

@@ -46,7 +46,7 @@ _cleanup()
 
 # Modify as appropriate.
 _supported_fs generic
-_supported_os IRIX Linux
+_supported_os Linux
 
 # real QA test starts here
 
@@ -78,14 +78,7 @@ echo data > subdir/file
 _ls_l subdir/file | awk '{ print $1, $3 }'
 
 # add an ACL with a user ACE which has no exec permission 
-if [ "$HOSTOS" == "Linux" ]; then
-    setfacl -m u:$acl1:r subdir
-elif [ "$HOSTOS" == "IRIX" ]; then
-    chacl u:$acl:r--,g::---,o::--- subdir
-else
-    echo "Unknown OS!"
-    exit 1
-fi
+setfacl -m u:$acl1:r subdir
 
 # With the bug this gives: `ls: subdir/file: Permission denied'
 # because one needs at least an exec perm somewhere in acl