tests: fix a few `(no-windows !)` conditionals that are really `(symlink !)`

The CI for py3 is assuming that symlinks are possible (they are when running as
Administrator or when Developer Mode is enabled), and these popped up.

Differential Revision: https://phab.mercurial-scm.org/D7232

tests/test-fileset.t

@@ -853,7 +853,7 b' small reminder of the repository state'
   M b2
   A 1k
   A 2k
-  A b2link (no-windows !)
+  A b2link (symlink !)
   A bin
   A c1
   A con.xml (no-windows !)
@@ -864,7 +864,7 b' small reminder of the repository state'
   M b2
   A 1k
   A 2k
-  A b2link (no-windows !)
+  A b2link (symlink !)
   A bin
   A c1
   A con.xml (no-windows !)
@@ -997,7 +997,7 b' test with multi revs revset'
   A .hgsubstate
   A 1k
   A 2k
-  A b2link (no-windows !)
+  A b2link (symlink !)
   A bin
   A c1
   A con.xml (no-windows !)
@@ -1006,7 +1006,7 b' test with multi revs revset'
   .hgsubstate
   1k
   2k
-  b2link (no-windows !)
+  b2link (symlink !)
   bin
   c1
   con.xml (no-windows !)