Resolve symlinks before file check (needed for Windows)

Signed-off-by: Filipe Laíns <lains@riseup.net>

Author: FFY00

Modules/getpath.py

@@ -774,12 +774,12 @@ def search_up(prefix, *landmarks, test=isfile):
 # ******************************************************************************
 
 # Warn if the standard library is missing
-if not stdlib_zip or not isfile(stdlib_zip):
+if not stdlib_zip or not isfile(realpath(stdlib_zip)):
     home_hint = f"The Python 'home' directory was set to {home!r}, is this correct?"
-    if not stdlib_dir or not isdir(stdlib_dir):
+    if not stdlib_dir or not isdir(realpath(stdlib_dir)):
         hint = home_hint if home else f'sys.prefix is set to {prefix}, is this correct?'
         warn('WARN: Could not find the standard library directory! ' + hint)
-    elif (not platstdlib_dir and not build_prefix) or not isdir(platstdlib_dir):
+    elif (not platstdlib_dir and not build_prefix) or not isdir(realpath(platstdlib_dir)):
         hint = home_hint if home else f'sys.exec_prefix is set to {exec_prefix}, is this correct?'
         warn('WARN: Could not find the platform standard library directory! ' + hint)