build cleanup
fix clang build
configure: _Float types
__int128 support
just predefine stdc inttypes
bison
build: fixes
build: PHP<7.2 compatibility
we need the typedef also for release builds
configure: generate less files, and do that in build dir
configure: add --enable-psi-maintainer-mode
raising the head after a three-weeks refactoring
autoconf: split into subdirectories; redirect calls in debug builds