update build machinery for pcc-20160208

update build framework for import of pcc-20140706

update for pcc-20120325

update for pcc-20120105

update build machinery for pcc-20110901

make PCC_DEBUG a global flag (will not compile without, currently)

use better method of creating version string, current method can
introduce spurious " characters during stringification

INCLUDEDIR and LIBEXECDIR only need to be defined for the
pcc front end

apply build framework and config changes for pcc-100602, plus add a
prepare-import.sh script for future updates

actually include the top-level Makefile.inc

keep generated config.h file in a subdir
(avoids potential inclusion errors)

provide endian information at build time rather than embedding it
in the config.h file.

amd64 provides MACHINE_ARCH=x86_64 but pcc wants TARGMACH=amd64. handle that

when making VERSSTR, provide the target os/machine rather than the host.
have the CVS checkout date in the PACKAGE_STRING rather than in a separate
definition

be more adaptable when choosing the target arch, try to relate
the MACHINE_ARCH to the supported architectures before failing.

just use the actual date in PACKAGE_CHECKOUT definition

fix the embedded VERSSTR by providing the correct machine architecture
at build time, and adding an import date to the version.

Clean up the build framework for pcc

- use <bsd.init.mk> to include <../Makefile.inc> files
- add Makefile.inc files that pull in appropriate build settings
- fix the LIBEXECDIR definition (sh

Clean up the build framework for pcc

- use <bsd.init.mk> to include <../Makefile.inc> files
- add Makefile.inc files that pull in appropriate build settings
- fix the LIBEXECDIR definition (should have trailing /)
- make cc.1 install as pcc.1 to match the binary
- use YHEADER= to build the yacc headers
- general consistency tidy up

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Add pcc build framework.