Fix python build on windows

package.json

@@ -23,7 +23,7 @@
     "test": "./node_modules/.bin/mocha src/node/test && npm run-script lint",
     "gen_docs": "./node_modules/.bin/jsdoc -c src/node/jsdoc_conf.json",
     "coverage": "./node_modules/.bin/istanbul cover ./node_modules/.bin/_mocha src/node/test",
-    "install": "./node_modules/.bin/node-pre-gyp install --fallback-to-build --library='static_library'"
+    "install": "./node_modules/.bin/node-pre-gyp install --fallback-to-build --library=static_library"
   },
   "bundledDependencies": ["node-pre-gyp"],
   "dependencies": {

setup.py

@@ -148,11 +148,13 @@ if "win32" in sys.platform:
 
 DEFINE_MACROS = (
     ('OPENSSL_NO_ASM', 1), ('_WIN32_WINNT', 0x600),
-    ('GPR_BACKWARDS_COMPATIBILITY_MODE', 1), ('HAVE_CONFIG_H', 1),)
+    ('GPR_BACKWARDS_COMPATIBILITY_MODE', 1),)
 if "win32" in sys.platform:
   DEFINE_MACROS += (('OPENSSL_WINDOWS', 1), ('WIN32_LEAN_AND_MEAN', 1),)
   if '64bit' in platform.architecture()[0]:
     DEFINE_MACROS += (('MS_WIN64', 1),)
+else:
+  DEFINE_MACROS += (('HAVE_CONFIG_H', 1),)
 
 LDFLAGS = tuple(EXTRA_LINK_ARGS)
 CFLAGS = tuple(EXTRA_COMPILE_ARGS)