CVS log for src/usr.bin/make/unit-tests/export.mk

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Handle deprecation of egrep

tests/make: migrate to jemalloc > 100

When I started working on usr.bin/make in 2020, I used NetBSD 8, which
used jemalloc 100.

After updating to NetBSD 8 to 9.99.x, the debugging options for jemalloc
stopped working since MALLOC_OPTIONS had been replaced with MALLOC_CONF
in 2019.

Enable malloc debugging again, to reliably reproduce the use-after-free
for the variable modifier ':@'.

make(1): use consistent indentation in variable assignments

Initial work by "pkglint -F *.mk", manually adjusted in a few places.

make(1): indent directives like .info, .if, .for consistently

Done by "pkglint -F *.mk", no manual corrections.

make(1): use consistent RCS Id in test files

make(1): document why the ampersand is not listed in export.exp

make(1): run tests with jemalloc debugging enabled

This protects against very simple memory allocation bugs such as
migrating Lst_ForEachUntil to Lst_ForEach without remembering that
Lst_ForEachUntil can handle the situation where the current list node is
removed from the list, but Lst_ForEach cannot.  This happens in
Make_ExpandUse, for example.

make(1): clean up Var_UnExport

Mark the parameter as constant since it is not modified.

Remove tests for '\n' since these can never succeed.

newenv can never be NULL since neither of bmake_malloc or bmake_realloc
returns NULL.

Improve variable names: vlist was too unexpressive.

Add debug logging since unexporting variables is an uncommon operation
that directly affects the observable environment of the child processes.

Fix CRLF line endings in a few unit tests.

Use egrep rather than grep -E

Also we need to exclude noise that some shells include.
This is why the original test restricted itself to checking
for UT_* in env.

make(1): add test for exporting single-character variables

make(1): prepare test for .export to show all exported variables

Currently the unit tests don't cover exporting of local variables like
.TARGET or @.  To see the effects, all exported variables must be listed
by the tests.

Give each group of tests its own output file.

* Rename each sub-makefile to *.mk;
* Add a *.exp file of expected output for each sub-makefile;
* Remove test.exp, which is replaced by all the other *.exp files.
* Use suffix rules to generate *.rawout and *.out files for
  each test case.
* Rewrite the test and accept targets to adapt to the new way.

The old (now removed) test.exp file is almost identical to the
concatenation (in the correct order) of all the new *.exp files.  There
are expected differences in makefile names embedded in the output, and
the new "exit status" lines.  Some old "*** Error code 1 (ignored)"
lines are also removed (replaced by new "exit status 1" lines).