that version in order to build compatible binaries. Also bump version
to 1.0.0.7.

that aren't exactly extensions and perfectly valid C++ identifiers.

and update the version of the extension for publishing.

using a naive regex for now.

around an MSYS bug in the main DLL, and copy the m4.exe binary we
ship with bison into the flex directory, too.

to external so as to avoid some autocompletion collisions with "configure".