run-tests: backout d7c23f4a14c7

We no longer have any data files, so this is no longer needed. Augie
Fackler reported on IRC that this "hack" had never worked for him in
the first place.

tests/run-tests.py

@@ -316,8 +316,8 b' def installhg(options):'
         nohome = ''
     cmd = ('%s setup.py %s clean --all'
            ' install --force --prefix="%s" --install-lib="%s"'
-           ' --install-scripts="%s" --install-data="%s" %s >%s 2>&1'
-           % (sys.executable, pure, INST, PYTHONDIR, BINDIR, INST, nohome,
+           ' --install-scripts="%s" %s >%s 2>&1'
+           % (sys.executable, pure, INST, PYTHONDIR, BINDIR, nohome,
               installerrs))
     vlog("# Running", cmd)
     if os.system(cmd) == 0: