apr: Update to version 1.7.6

apr: Update to version 1.7.6

- Update from version 1.7.5 to 1.7.6
- Update of rootfile
- Changelog
    1.7.6
	  *) test/testsock.c (test_get_addr): Fix test to portably switch
	     the socket to non-blocking mode using apr_socket_timeout_set().
	     Also make the test SKIP for the case where the connect() completes
	     synchronously. [Ivan Zhakov]
	  *) network_io/win32/sockets.c: (apr_socket_connect): Copy the remote
	     address by value rather than by reference.  This ensures that the
	     sockaddr object returned by apr_socket_addr_get is allocated from
	     the same pool as the socket object itself, as apr_socket_accept
	     does; avoiding any potential lifetime mismatches. [Ivan Zhakov]
	  *) CMake: Install include/apr_encode.h. [Ivan Zhakov]
	  *) CMake: Fix installation PDB files with multi-config generators.
	     [Ivan Zhakov]

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>