Fixed possible precision loss in microtime

This is related to the fix for bug #64370. MSVC natively supports __int64 type,
so calculating with 32 bit ints is neither necessary nor reliable. Therefore
an older piece of code is reused.
Reworked the changes for bug #64452
It's 2013, even for a manpage
Fixed bug #63914 (zend_do_fcall_common_helper_SPEC does not handle exceptions properly). (Jeff Welch)
This will PHP 5.3.25
Exclude Travis build for 5.3 and 5.4
Fix test
Fixed bug #64578 (debug_backtrace in set_error_handler corrupts zend heap: segfault)
no tab here
Fixed bugs #47675 and #64577 (fd leak on Solaris)
fix null deref
fix possible NULL deref
PHP 5.3.24 release date
add external 2.1 detection and fix gd_compat for 2.1+
Fixed bug #64342 ZipArchive::addFile() has to check for file existence
Merge branch 'PHP-5.3' of git.php.net:php-src into PHP-5.3