add config.guess to tools so its available prior to any package builds
Makefile: add BUILD variable and add to target loop and PATH
package libtool: separate binary from library (new package libltdl)
add package m4 for native build
native packages: tidy up and install to BUILD prefix to avoid conflicts
packages graphicsmagick guile imagemagick sox: change libtool --> libltdl
Makefile: remove TARGET dependencies on BUILD - keep optional for time being
package graphicsmagick: temporary workaround for pkgconf