This fixes the problem that when CC is set, the LDSHAREd is not
set accordingly on linux.
Upstream bug filed at https://bugs.python.org/issue24935

--- a/Lib/distutils/sysconfig.py
+++ b/Lib/distutils/sysconfig.py
@@ -207,10 +207,10 @@ def customize_compiler(compiler):
 
         if 'CC' in os.environ:
             newcc = os.environ['CC']
-            if (sys.platform == 'darwin'
+            if ((sys.platform == 'darwin' or sys.platform.startswith('linux'))
                     and 'LDSHARED' not in os.environ
                     and ldshared.startswith(cc)):
-                # On OS X, if CC is overridden, use that as the default
+                # On OS X and linux, if CC is overridden, use that as the default
                 #       command for LDSHARED as well
                 ldshared = newcc + ldshared[len(cc):]
             cc = newcc