Description:
------------
The root problem is both MIT Kerberos and Zend define a constant named SUCCESS in an enum when compiling --with-krb5kadm. This results in a collision when compiling.

Test script:
---------------
php_krb5_kadm.h has a broken workaround for this, but still results in following compiler error:

$ phpize
$ ./configure --with-krb5kadm
$ make
/usr/include/gssrpc/rpc_msg.h:66:2: error: redeclaration of enumerator 'SUCCESS'
/usr/include/php5/Zend/zend.h:282:3: note: previous definition of 'SUCCESS' was here

Expected result:
----------------
krb5 compiles OK.

Actual result:
--------------
krb5 doesn't compile. Using the attached file, I was able to compile and deploy the krb5 module. My only concern is whether my patch is too universal and may fail a regression test I'm not thinking of. I will test some code with this module and post to this bug if something breaks.