Issue #8447: Make distutils.sysconfig follow symlinks in the path to

the interpreter executable.  This fixes a failure of test_httpservers
on OS X.

sysconfig.py

@@ -25,7 +25,7 @@ EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
 # Path to the base directory of the project. On Windows the binary may
 # live in project/PCBuild9.  If we're dealing with an x64 Windows build,
 # it'll live in project/PCbuild/amd64.
-project_base = os.path.dirname(os.path.abspath(sys.executable))
+project_base = os.path.dirname(os.path.realpath(sys.executable))
 if os.name == "nt" and "pcbuild" in project_base[-8:].lower():
     project_base = os.path.abspath(os.path.join(project_base, os.path.pardir))
 # PC/VS7.1
@@ -77,7 +77,7 @@ def get_python_inc(plat_specific=0, prefix=None):
             # the build directory may not be the source directory, we
             # must use "srcdir" from the makefile to find the "Include"
             # directory.
-            base = os.path.dirname(os.path.abspath(sys.executable))
+            base = os.path.dirname(os.path.realpath(sys.executable))
             if plat_specific:
                 return base
             else:
@@ -223,7 +223,8 @@ def get_config_h_filename():
 def get_makefile_filename():
     """Return full pathname of installed Makefile from the Python build."""
     if python_build:
-        return os.path.join(os.path.dirname(sys.executable), "Makefile")
+        return os.path.join(os.path.dirname(os.path.realpath(sys.executable)),
+                            "Makefile")
     lib_dir = get_python_lib(plat_specific=1, standard_lib=1)
     return os.path.join(lib_dir, "config", "Makefile")
 
@@ -442,7 +443,7 @@ def _init_nt():
     g['SO'] = '.pyd'
     g['EXE'] = ".exe"
     g['VERSION'] = get_python_version().replace(".", "")
-    g['BINDIR'] = os.path.dirname(os.path.abspath(sys.executable))
+    g['BINDIR'] = os.path.dirname(os.path.realpath(sys.executable))
 
     global _config_vars
     _config_vars = g