devel/upp: update to 8227 and improve

• Adapt MASTER_SITES
• Adapt MACRO_FLAGS
• Adapt include directories for CINC
• Adapt sed patches
• Adapt GCC build method
• Add LICENSE_FILE
• Add execinfo to USES
• Add creation of CLANG build method, based on GCC with some changes
• Add patch to build U++ package(s) using modern GCC [1]
• Add patch to delete *.bm files for local install, not just GCC.bm [2]
• Add patches for some U++ packages to compile on FreeBSD [3]
• Do not copy (unused) empty directories to DATADIR
• Wrap cd related command to parentheses

Changes: http://upp.sf.net/www$uppweb$Roadmap$en-us.html
PR: 198359
Submitted by: lightside <lightside@gmx.com>
Approved by: m.sund@arcor.de (maintainer)
Obtained from: https://code.google.com/p/upp-mirror/source/detail?r=8242 [1]
Obtained from: https://code.google.com/p/upp-mirror/source/detail?r=8251 [2]
Obtained from: https://code.google.com/p/upp-mirror/source/detail?r=8267 [3]
Obtained from: https://code.google.com/p/upp-mirror/source/detail?r=8268 [3]