libstdc++47: Rework to prevent regeneration during install

The installincludes target regenerated files such as c++config.h during
the install phase. It may be a minor bug as "bits/c++config.h:" wo

libstdc++47: Rework to prevent regeneration during install

The installincludes target regenerated files such as c++config.h during
the install phase. It may be a minor bug as "bits/c++config.h:" would
trigger it but "c++config.h:" without the subdirectory wouldn't. In any
case, generating it and two other headers to the local working bits
directory wasn't necessary as installincludes target installs them in an
accessible location. Reworking the makefiles prevents a write operation
during installworld.

Reported-by: dillon

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libstdc++47: fix wrong vec.o inclusion

The vec.cc file never got compiled for libstdc++. The gcc/vec.c object
file was getting included into the library instead. This change
effectively renames ve

libstdc++47: fix wrong vec.o inclusion

The vec.cc file never got compiled for libstdc++. The gcc/vec.c object
file was getting included into the library instead. This change
effectively renames vec.cc to avoid name clashes.

This also allows gcc47 to completely build world.

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gcc47: Add DragonFly READMEs and world makefiles