windows: use abspath in mercurial/hg.py

We replace `os.path.abspath` with `util.abspath`. This should solve more "drive
capitalization" issue on Windows.

Differential Revision: https://phab.mercurial-scm.org/D11063

mercurial/hg.py

@@ -567,7 +567,7 b' def clonewithshare('
 
     # Resolve the value to put in [paths] section for the source.
     if islocal(source):
-        defaultpath = os.path.abspath(urlutil.urllocalpath(source))
+        defaultpath = util.abspath(urlutil.urllocalpath(source))
     else:
         defaultpath = source
 
@@ -821,7 +821,7 b' def clone('
 
         abspath = origsource
         if islocal(origsource):
-            abspath = os.path.abspath(urlutil.urllocalpath(origsource))
+            abspath = util.abspath(urlutil.urllocalpath(origsource))
 
         if islocal(dest):
             if os.path.exists(dest):