configure: a skinny configuration script.

supported switches:

-------------------

	--help

	--nickname

	--avoid-version

	--source-dir

	--prefix

	--exec-prefix

	--bindir

	--libdir

	--includedir

	--mandir

	--docdir

	--libexecdir

	--build

	--host

	--target

	--arch

	--compiler

	--toolchain

	--sysroot

	--cross-compile

	--shell

	--debug

	--strict

	--ccstrict

	--ldstrict

	--all-static

	--all-shared

	--enable-static

	--enable-shared

	--disable-static

	--disable-shared

	--enable-app

	--enable-frontend

	--disable-app

	--disable-frontend

supported variables:

--------------------

	NICKNAME

	SOURCE_DIR

	PREFIX

	EXEC_PREFIX

	BINDIR

	LIBDIR

	INCLUDEDIR

	MANDIR

	DOCDIR

	LIBEXECDIR

	CC

	CPP

	CXX

	BUILD

	HOST

	TARGET

	ARCH

	COMPILER

	TOOLCHAIN

	SYSROOT

	CROSS_COMPILE

	SHELL

	CFLAGS

	CFLAGS_DEBUG

	CFLAGS_COMMON

	CFLAGS_CMDLINE

	CFLAGS_CONFIG

	CFLAGS_SYSROOT

	CFLAGS_PATH

	CFLAGS_STRICT

	CFLAGS_UTIL

	CFLAGS_LAST

	CFLAGS_ONCE

	LDFLAGS

	LDFLAGS_DEBUG

	LDFLAGS_COMMON

	LDFLAGS_CMDLINE

	LDFLAGS_CONFIG

	LDFLAGS_SYSROOT

	LDFLAGS_PATH

	LDFLAGS_STRICT

	LDFLAGS_UTIL

	LDFLAGS_LAST

	LDFLAGS_ONCE

	PE_SUBSYSTEM

	PE_IMAGE_BASE

	PE_CONFIG_DEFS

	ELF_EH_FRAME

	ELF_HASH_STYLE

	ELF_CONFIG_DEFS

	NATIVE_CC

	NATIVE_OS

	NATIVE_OS_BITS

	NATIVE_OS_UNDERSCORE