Add missing openssl include path. (#46)

* Add missing openssl include path.

* Add HAVE_LIBCRYPTO.

setup.py

@@ -178,6 +178,7 @@ class BuildExtCommand(build_ext):
       module.libraries.append('ws2_32')
 
     if building_for_osx:
+      module.include_dirs.append('/usr/local/opt/openssl/include')
       module.include_dirs.append('/opt/local/include')
       module.library_dirs.append('/opt/local/lib')
       module.include_dirs.append('/usr/local/include')
@@ -200,6 +201,7 @@ class BuildExtCommand(build_ext):
         if (has_function('MD5_Init', libraries=['crypto']) and
             has_function('SHA256_Init', libraries=['crypto'])):
           module.define_macros.append(('HASH_MODULE', '1'))
+          module.define_macros.append(('HAVE_LIBCRYPTO', '1'))
           module.libraries.append('crypto')
         else:
           exclusions.append('yara/libyara/modules/hash.c')