Subject: tests: disable part of test-run-tests.t

The install test relies on pip which we don't have in the build
environment.  And with pip installed it warns about using the wrong
mercurial lib.

diff --git a/tests/test-run-tests.t b/tests/test-run-tests.t
index dbee59e0..0ede4dca 100644
--- a/tests/test-run-tests.t
+++ b/tests/test-run-tests.t
@@ -6,22 +6,24 @@ Avoid interference from actual test env:
   $ . "$TESTDIR/helper-runtests.sh"
 
 Smoke test with install
 ============
 
   $ PIP_NO_CACHE_DIR=1
   $ export PIP_NO_CACHE_DIR
 
+#if false
   $ (testrepohgenv; "$PYTHON" $TESTDIR/run-tests.py --pure)
   installed Mercurial in * seconds  (glob)
   running 0 tests using 0 parallel processes 
   
   # Ran 0 tests, 0 skipped, 0 failed.
 
+#endif
 
 Define a helper to avoid the install step
 =============
   $ rt()
   > {
   >     "$PYTHON" $TESTDIR/run-tests.py \
   >         $HGTEST_RUN_TESTS_PURE \
   >         --with-hg=$HGTEST_REAL_HG \