Extra commenting for FONTFORGE_COMPILER_FLAGS()
Removed Makefile.am check for generate_codepoint_selector.py

Was checking for a python program that was removed earlier.
There are no boolean references in FontForge - removed AC_HEADER_STDBOOL

Configure.ac had this defined but FontForge isn't using boolean values
anywhere or making use of <stdbool.h>, but this is checked by autogen.sh
for doing the autoconf steps, plus AC_HEADER_STDBOOL breaks on systems
that are not conforming to C99 such as (Sparc Solaris 9 with Sun Studio 12
or Mac OS X 10.6 with Xcode 3.2) at this point in time. Basic.h already
has true=1/false=0 defined. _Bool isn't defined anywhere.
Merge pull request #565 from JoesCat/master

a few edits around configure.ac area