subversion: upgrade 1.11.1 -> 1.12.0

subversion: upgrade 1.11.1 -> 1.12.0

- Backport a patch to fix build failure while APR 1.7.0
...
checking for apr_int64_t Python/C API format string...
configure: error: failed to recognize APR_INT64_T_FMT on this platform
...

- Rebase disable_macos.patch and serfmacro.patch

License-update: no change, declare two new added file
* in build/ac-macros/ax_boost_base.m4
* in build/ac-macros/ax_boost_unit_test_framework.m4

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>