Fix issues associated with Xcode 5.1

[corydolphin]

Should fix #4

[jamarparris]

Hey there:

I cloned the repo, checked out master and run "python setup.py build" I got an error. I then checked out patch/xcode5.1 and I got another error when I tried to import bcrypt. Both are below.

Error from master:

running build
running build_py
creating build
creating build/lib.macosx-10.9-intel-2.7
creating build/lib.macosx-10.9-intel-2.7/bcrypt
copying bcrypt/__init__.py -> build/lib.macosx-10.9-intel-2.7/bcrypt
running build_ext
building 'bcrypt._bcrypt' extension
creating build/temp.macosx-10.9-intel-2.7
creating build/temp.macosx-10.9-intel-2.7/bcrypt
cc -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -arch i386 -pipe -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c bcrypt/bcrypt_python.c -o build/temp.macosx-10.9-intel-2.7/bcrypt/bcrypt_python.o
clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
error: command 'cc' failed with exit status 1

Error from patch/xcode5.1

running build
running build_py
running build_ext
building 'bcrypt._bcrypt' extension
cc -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -arch i386 -pipe -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c bcrypt/bcrypt_python.c -o build/temp.macosx-10.9-intel-2.7/bcrypt/bcrypt_python.o -Wno-error=unused-command-line-argument-hard-error-in-future
clang: warning: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
clang: warning: argument unused during compilation: '-mno-fused-madd'
cc -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -arch i386 -pipe -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c bcrypt/blowfish.c -o build/temp.macosx-10.9-intel-2.7/bcrypt/blowfish.o -Wno-error=unused-command-line-argument-hard-error-in-future
clang: warning: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
clang: warning: argument unused during compilation: '-mno-fused-madd'
cc -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -arch i386 -pipe -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c bcrypt/bcrypt.c -o build/temp.macosx-10.9-intel-2.7/bcrypt/bcrypt.o -Wno-error=unused-command-line-argument-hard-error-in-future
clang: warning: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
clang: warning: argument unused during compilation: '-mno-fused-madd'
cc -bundle -undefined dynamic_lookup -arch x86_64 -arch i386 -Wl,-F. build/temp.macosx-10.9-intel-2.7/bcrypt/bcrypt_python.o build/temp.macosx-10.9-intel-2.7/bcrypt/blowfish.o build/temp.macosx-10.9-intel-2.7/bcrypt/bcrypt.o -o build/lib.macosx-10.9-intel-2.7/bcrypt/_bcrypt.so

Attempt at import
Python 2.7.5 (default, Aug 25 2013, 00:04:04)
[GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.0.68)] on darwin
Type "help", "copyright", "credits" or "license" for more information.

import bcrypt
Traceback (most recent call last):
File "", line 1, in
File "bcrypt/init.py", line 26, in
from bcrypt._bcrypt import *
ImportError: No module named _bcrypt