calc 2.15.0.2 release

[lcn2]

The following are the changes in this release:

Updated BUGS about MSYS2 on Windows compiling of calc.

Added more git related checks and sanity checks to chk_tree.

Added ${FSANITIZE} make variable to Makefile.config to hold
common Address Sanitizer (ASAN) optins to modern Linux and macOS.
The Address Sanitizer is NOT enabled not compiled in by default.
Improved comments in Makefile.local for RHEL9.2 (Linux) and for
macOS 14.0 that, when uncommented and calc is recompiled (i.e.,
make clobber all) will enable the Address Sanitizer (ASAN) for calc.

Fixed memory leaks in the logn, aversin, acoversin, avercos,
acovercos, ahaversin, ahavercos, ahacovercos, aexsec,
aexcsc, and acrd.

Fixed a compile error in zmath.h that impacted legacy 32-bit Big
Endian machines.  Thanks goes to GitHub user @gromit1811 for their
pull request.

Fixed the check for <sys/mount.h> when forming have_sys_mount.h.
Thanks goes to GitHub user @gromit1811 for their pull request.

Added "STATIC bool blum_initialized = false" to zrandom.c to improve
how the code detects if the Blum-Blum-Shub pseudo-random number
generator is seeded or not, and how to free the state correctly.

NOTE: There is a very minor memory leak in zrandom.c that will be
fixed in a later release.

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This discussion was created from the release calc 2.15.0.2 release.

[lcn2]

NOTE: There is a very minor memory leak in zrandom.c that will be
fixed in a later release.

The minor memory leak occurs when the Blum-Blum-Shub pseudo-random number is seeded. Reseeding does not cause the leak to grow, so the leak is a small fixed amount that remains constant if the Blum-Blum-Shub pseudo-random number generator is used.

We plan to rewrite the way that zrandom.c works, but we didn't want to do this before a stable release.

So this will be addressed, along with documentation updates as per issue #133 in the 2.15.0.3 release. None of these are critical, thus we pushed out this release today.