Log Message:
apr: update to 1.7.5.

pkgsrc change: remove patches for atomic64 support since upstream
seems to have improved their generic64 support.

Changes for APR 1.7.5

  *) Unix: Implement apr_shm_perms_set() for the "POSIX shm_open()"
     and "classic mmap" shared memory implementations.  [Joe Orton,
     Ruediger Pluem]

  *) Fix missing ';' for XML/HTML hex entities from apr_escape_entity().
     [Yann Ylavic]

  *) Fix crash in apr_pool_create() with --enable-pool-debug=all|owner.
     [Yann Ylavic]

  *) Improve platform detection by updating config.guess and config.sub.
     [Rainer Jung]

  *) CMake: Add support for CMAKE_WARNING_AS_ERROR. [Ivan Zhakov]

  *) CMake: Enable support for MSVC runtime library selection by abstraction.
     [Ivan Zhakov]

  *) CMake: Export installed targets (libapr-1, apr-1, libaprapp-1, aprapp-1)
     to apr:: namespace. [Ivan Zhakov]