tests: conditionalize out tests that msys is mangling

This was exposed by ac0a87160012.  The paths for convert and ssh respectively
are being turned into:

   $TESTTMP\bzr+ssh:\[e-mail]\baz\.hg

   'C:\\C:\\Users\\Matt\\AppData\\Local\\Temp\\hgtests.8awa9x\\child1\\test-ssh-bundle1.t-sshv2\\nonexistent\\.hg

The errno value raised is 123, and the message is

   The filename, directory name, or volume label syntax is incorrect

tests/test-convert.t

@@ -533,9 +533,11 b' contents of fncache file:'
 
 test bogus URL
 
+#if no-msys
   $ hg convert -q bzr+ssh://[e-mail]/baz baz
   abort: bzr+ssh://[e-mail]/baz: missing or unsupported repository
   [255]
+#endif
 
 test revset converted() lookup
 

tests/test-ssh-bundle1.t

@@ -59,10 +59,12 b' repo not found error'
 
 non-existent absolute path
 
+#if no-msys
   $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy//`pwd`/nonexistent local
   remote: abort: repository /$TESTTMP/nonexistent not found!
   abort: no suitable response from remote hg!
   [255]
+#endif
 
 clone remote via stream
 
@@ -502,7 +504,7 b' debug output'
 
   $ cat dummylog
   Got arguments 1:user@dummy 2:hg -R nonexistent serve --stdio
-  Got arguments 1:user@dummy 2:hg -R /$TESTTMP/nonexistent serve --stdio
+  Got arguments 1:user@dummy 2:hg -R /$TESTTMP/nonexistent serve --stdio (no-msys !)
   Got arguments 1:user@dummy 2:hg -R remote serve --stdio
   Got arguments 1:user@dummy 2:hg -R local-stream serve --stdio (no-reposimplestore !)
   Got arguments 1:user@dummy 2:hg -R remote serve --stdio (no-reposimplestore !)