update build machinery for pcc-20160208

update build framework for import of pcc-20140706

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

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

Install PCC cpp as libexec/pcpp to avoid name conflicts with other
compilers (eg GCC), and to match the manpage which is already installed
as pcpp.1

(Gregory McGarry: "I think it's a good idea")

only go to WARNS=2 on these by default

Install the CPP manpage as pcpp(1) to avoid conflicts with the GCC 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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Update build system and merge changes for pcc 0.9.9 090902.

Fix path to correct source directory.

Add pcc build framework.