test-hardlinks: unify two test files into one

The "whitelisted" test could be unified using "#if"s.

tests/test-hardlinks.t

@@ -10,7 +10,7 b''
 
   $ nlinksdir()
   > {
-  >     find $1 -type f | python $TESTTMP/nlinks.py
+  >     find "$@" -type f | python $TESTTMP/nlinks.py
   > }
 
 Some implementations of cp can't create hardlinks (replaces 'cp -al' on Linux):
@@ -168,6 +168,11 b' Push to repo r1 should break up most har'
   2 r2/.hg/store/data/f1.i
   [12] r2/\.hg/store/fncache (re)
 
+#if hardlink-whitelisted
+  $ nlinksdir r2/.hg/store/fncache
+  2 r2/.hg/store/fncache
+#endif
+
   $ hg -R r2 verify
   checking changesets
   checking manifests
@@ -193,6 +198,10 b' Committing a change to f1 in r1 must bre'
   1 r2/.hg/store/data/f1.i
   [12] r2/\.hg/store/fncache (re)
 
+#if hardlink-whitelisted
+  $ nlinksdir r2/.hg/store/fncache
+  2 r2/.hg/store/fncache
+#endif
 
   $ cd r3
   $ hg tip --template '{rev}:{node|short}\n'
@@ -246,6 +255,12 b' r4 has hardlinks in the working dir (not'
   2 r4/d1/f2
   2 r4/f1
 
+#if hardlink-whitelisted
+  $ nlinksdir r4/.hg/undo.backup.dirstate r4/.hg/undo.dirstate
+  4 r4/.hg/undo.backup.dirstate
+  4 r4/.hg/undo.dirstate
+#endif
+
 Update back to revision 11 in r4 should break hardlink of file f1:
 
   $ hg -R r4 up 11
@@ -289,6 +304,11 b' Update back to revision 11 in r4 should '
   2 r4/d1/f2
   1 r4/f1
 
+#if hardlink-whitelisted
+  $ nlinksdir r4/.hg/undo.backup.dirstate r4/.hg/undo.dirstate
+  4 r4/.hg/undo.backup.dirstate
+  4 r4/.hg/undo.dirstate
+#endif
 
 Test hardlinking outside hg: