Major optimizations for 'make index' and other recursive traversal
targets.
* Use /rescue/sh for index builds instead of /bin/sh, when it exists.
The former is statically linked and faster to execute, which becomes
significant when executing it tens of thousands of times. This
trick can be used with other recursive targets by passing in
__MAKE_SHELL.
* Get rid of make variable assignments that use != command invocations
in the critical path, using several methods:
- rewriting logic to use shell or make builtins instead of external command
executions
- macroizing commands and executing them in the targets where they
are needed instead of with every invocation of make
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* Be even more explicit about partial ports trees being unsupported
for INDEX builds [1]
* Remove the parallel target from Makefile; this is heavily tied to
the package build cluster and can be better done in the makeparallel
script (commit to follow) [2]
* Extend the format of INDEX to separately list the
EXTRACT/PATCH/FETCH_DEPENDS instead of lumping them all in together
with BUILD_DEPENDS. The three new fields are appended to the end of
the record in that order. [2]
* Change BROKEN to IGNORE in BROKEN_WITH_MYSQL failure code [3]
* Support non-default PREFIX for perl 5.00503 [5]
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