We map the POSIX semantics of `IPC_PRIVATE` by creating unnamed file
mapping objects on Windows.  While that is not particularly useful for
ext/shmop, which is the only bundled extension which uses `shmget()`,
it may be useful for external extensions.

If the descriptor's refcount drops to zero, we have to unmap the
respective file view, to avoid leaking memory.

* PHP-7.2:
  Fix #78282: atime and mtime mismatch

The fix for bug #78241 assumed that `time_t` would always be 64bit, but
actually is 32bit for x86.  We therefore enforce 64bit arithmetic to
avoid wrapping.

(cherry picked from commit bf242d58e77d50d4d8fdaaaca7ede686ec4467c0)

* PHP-7.2:
  Fix #78241: touch() does not handle dates after 2038 in PHP 64-bit

`time_t` defaults to `_time64` (which is 64bit signed) even on x86, but
`Int32x32To64()` truncates it to signed 32bit.  We replace the macro
with the "manual" calculation.

If TSRM is shut down and started again (something that phpdbg does),
then tsrmls_id needs to be reloaded everywhere. As tsrmls_id
update is a rare operation, doing that shouldn't be a problem.

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines.

According to POSIX, a line is a sequence of zero or more non-' <newline>'
characters plus a terminating '<newline>' character. [1] Files should
normally have at least one final newline character.

C89 [2] and later standards [3] mention a final newline:
"A source file that is not empty shall end in a new-line character,
which shall not be immediately preceded by a backslash character."

Although it is not mandatory for all files to have a final newline
fixed, a more consistent and homogeneous approach brings less of commit
differences issues and a better development experience in certain text
editors and IDEs.

[1] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206
[2] https://port70.net/~nsz/c/c89/c89-draft.html#2.1.1.2
[3] https://port70.net/~nsz/c/c99/n1256.html#5.1.1.2