tests: drop "absimport" conditionals which should be always true

tests/hghave.py

@@ -585,12 +585,6 b' def has_debhelper():'
 def has_demandimport():
     return os.environ.get('HGDEMANDIMPORT') != 'disable'
 
-@check("absimport", "absolute_import in __future__")
-def has_absimport():
-    import __future__
-    from mercurial import util
-    return util.safehasattr(__future__, "absolute_import")
-
 @check("py3k", "running with Python 3.x")
 def has_py3k():
     return 3 == sys.version_info[0]

tests/test-extension.t

@@ -164,7 +164,6 b' Check "from __future__ import absolute_i'
   $ touch $TESTTMP/libroot/mod/__init__.py
   $ echo "s = 'libroot/mod/ambig.py'" > $TESTTMP/libroot/mod/ambig.py
 
-#if absimport
   $ cat > $TESTTMP/libroot/mod/ambigabs.py <<EOF
   > from __future__ import absolute_import
   > import ambig # should load "libroot/ambig.py"
@@ -178,7 +177,6 b' Check "from __future__ import absolute_i'
   $ (PYTHONPATH=${PYTHONPATH}${PATHSEP}${TESTTMP}/libroot; hg --config extensions.loadabs=loadabs.py root)
   ambigabs.s=libroot/ambig.py
   $TESTTMP/a (glob)
-#endif
 
 #if no-py3k
   $ cat > $TESTTMP/libroot/mod/ambigrel.py <<EOF
@@ -277,7 +275,7 b' Check absolute/relative import of extens'
   $TESTTMP/a (glob)
 #endif
 
-#if demandimport absimport
+#if demandimport
 
 Examine whether module loading is delayed until actual referring, even
 though module is imported with "absolute_import" feature.