Fix 64-bit Mac compilation errors in src/crypto.

third_party/mach_override/mach_override.c

 /*******************************************************************************
         mach_override.c
                 Copyright (c) 2003-2009 Jonathan 'Wolf' Rentzsch: <http://rentzsch.com>
                 Some rights reserved: <http://opensource.org/licenses/mit-license.php>
 
         ***************************************************************************/
 
 #include "mach_override.h"
 
 #include <mach-o/dyld.h>
@@ skipping 353 matching lines @@
         assert( island );
         
         mach_error_t    err = err_none;
         
         if( allocateHigh ) {
                 vm_size_t pageSize;
                 err = host_page_size( mach_host_self(), &pageSize );
                 if( !err ) {
                         assert( sizeof( BranchIsland ) <= pageSize );
 #if defined(__x86_64__)
-                        vm_address_t first = (uint64_t)originalFunctionAddress & ~(uint64_t)(((uint64_t)1 << 31) - 1) | ((uint64_t)1 << 31); // start in the middle of the page?
+                        vm_address_t first = ((uint64_t)originalFunctionAddress & ~(uint64_t)(((uint64_t)1 << 31) - 1)) | ((uint64_t)1 << 31); // start in the middle of the page?
                         vm_address_t last = 0x0;
 #else
                         vm_address_t first = 0xffc00000;
                         vm_address_t last = 0xfffe0000;
 #endif
 
                         vm_address_t page = first;
                         int allocated = 0;
                         vm_map_t task_self = mach_task_self();
                         
@@ skipping 314 matching lines @@
 );
 #elif defined(__x86_64__)
 void atomic_mov64(
                 uint64_t *targetAddress,
                 uint64_t value )
 {
     *targetAddress = value;
 }
 #endif
 #endif