If no php_build dir is specified, then look for either of the two
"standard" things in reasonable locations.
Allow CHECK_LIB to search for the "same" library using a ; separated
list of alternatives.
Tweak nsapi config and remove redundant or unused flags.
Add ZTS checks for both isapi and nsapi configs.
Disable apache and isapi by default.
Add some smarts so that we can really build extensions and SAPI found in php-src/pecl and/or php-src/../pecl.
Only include a logo in the resources if we are building an .exe.