New build system problems

[Martin Buchholz]

I was trying out the shiny new build system.

Problem: configure is not executable - must run bash ./configure
It's traditional for configure scripts to be executable.

Problem: Your life is hell if you have a non-compiler "cl" command on your
PATH, even on Linux.

checking for cl... /usr/bin/cl
configure: Resolving CC (as /usr/bin/cl) failed, using /usr/bin/cl directly.

with subsequent failure to compile.

Even if you specify the compiler explicitly, it doesn't help:

CC=/usr/bin/gcc CXX=/usr/bin/g++ bash ./configure

Of course, one can work around this by creating a "tools dir", but excising
the unloved cl from the configure script is tempting and effective.