apr: Update 1.7.2 => 1.7.4

apr: Update 1.7.2 => 1.7.4

For details see:
https://downloads.apache.org/apr/CHANGES-APR-1.7

"Changes for APR 1.7.4

  *) Fix a regression where writing to a file opened with both APR_FOPEN_APPEND
     and APR_FOPEN_BUFFERED did not properly append the data on Windows.
     (This regression was introduced in APR 1.7.3)  [Evgeny Kotkov]

Changes for APR 1.7.3

  *) apr-1-config: Fix crosscompiling detection in apr-1-config. PR 66510
     [Ruediger Pluem]

  *) configure: Add --enable-sysv-shm to use SysV shared memory (shmget) if
     available. [Ruediger Pluem]

  *) apr_socket_sendfile: Use WSAIoctl() to get TransmitFile function
     pointer on Windows. [Ivan Zhakov]

  *) apr_dir_read: Do not request short file names on Windows 7
     and later. [Ivan Zhakov]

  *) apr_file_gets: Optimize for buffered files on Windows.
     [Evgeny Kotkov]

  *) Fix a deadlock when writing to locked files opened with APR_FOPEN_APPEND
     on Windows. PR 50058. [Evgeny Kotkov]

  *) Don't seek to the end when opening files with APR_FOPEN_APPEND on Windows.
     [Evgeny Kotkov]

  *) apr_file_write: Optimize large writes to buffered files on Windows.
     [Evgeny Kotkov]

  *) apr_file_read: Optimize large reads from buffered files on Windows.
     [Evgeny Kotkov]"

Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org>