This allows PHPC to defer entirely to libmongoc for cross-option URI validation
Bump libmongoc to 1.21-dev
Build changes are ported from upstream CMake changes (see: CDRIVER-4249)
The AC_CHECK_FUNC macro has only the following form:
AC_CHECK_FUNC(function, [action-if-found], [action-if-not-found])
In most cases adding more arguments to macro call don't cause errors,
but it also doesn't have any functionality either.
GitHub's file finder filters out "build/" directories, among others, which can make it difficult to quickly access these files. Also, the "build/" directory doesn't provide much value here, since it only contains "autotools/".
Jeremy Mikola