Fix the retry limit for resizing password entry buffer

See merge request !212

Fix an incorrect error check detected by the GCC analyzer

See merge request !211

The previous version checked that the buffer had not exceeded the
limit of 1MiB after the buffer was resized.  In otherwords, the buffer
is allowed to grow past the limit before the retry loop is exited.

This change moves the check of the buffer size before the allocation
occurs.  Now, the retry loop is exited before the buffer would grow
past the limit.

The return value of open(2) should be compared with -1 to check for an
error but it was compared with 0 instead.

Fix a double free detected by the GCC analyzer

See merge request !210

The obuffer variable contained a pointer to a block of memory freed by
realloc(3) if the ERANGE case was executed more than once.  Afterward,
if the 0 case executed, obuffer would be passed to free(3) causing a
double free.

This change sets the value of obuffer to buffer immediately after a
successful call to realloc(3) ensure it is always NULL or a valid
block of memory.

Fix #303: Remove unused var *assert-not-standard-readtable*

Closes #303

See merge request !209

According to [fc0bd2a6] this change was supposed to be removed but
never was.  Let's do it now.  This was also the only place where we
used C++ comment-style.

Snapshots have been uploaded so use them for running the CI.

Fix #293:  Allow restarts for FP overflow in reader

Closes #293, #275, and #287

See merge request !201

Fix #275:  FP underflow in reader allows restart with 0

Closes #275 and #287

See merge request !197

Fix #296:  Fix disassembly of MOVD instruction

Closes #296 and #300

See merge request !207

Explain why we use `-V` for `bin/make-dist.sh`.  And instead of using
"ci-build" as the version, use `git describe --dirty` as the version.
This lets us know better what version was actually used for the build.

Fix #299: Use xoroshiro assembly routine for x86

Closes #299, #295, #300, #297, and #294

See merge request !208

Fix #298: Add with-float-rounding-mode macro

Closes #298

See merge request !205

Fix #294: Implement assembly routine for xoroshiro update

Closes #294

See merge request !202

Mention that the allowed values are the same as the values for the
rounding-mode in `set-floating-point-modes`.

Change indentation of docstring slightly so that it prints nicely via
`describe`.  (Emacs doesn't indent the docstring by the right amount
for `describe`.)

We renamed `old-rounding-mode` to `old-mode`, but forgot to update all
uses.

Fix #295:  Add docstring for define-assembly-routine

Closes #295

See merge request cmucl/cmucl!204

Fix #300: Reduce code duplication in random

Closes #300

See merge request cmucl/cmucl!206

Fix #297:  Print new-assem:assemble with less indentation

Closes #297

See merge request cmucl/cmucl!203

No other changes.

Not 100% sure the expected results are right.  They seem plausible,
but I didn't actually analyze that the rounding is correct.

Add `ext:with-float-rounding-mode` macro to set the FP rounding mode
to be used when executing the body.

Forgot to add #288, #290, and #291 to the list of fixed issues.

Fix #291:  pprint handler-case neatly

Closes #291

See merge request !200