draft release notes for 0.9.15

[Rich Felker <dalias@aerifal.cx>]

See draft below. Comments welcome, especially on what's the most
important to go in the short release blurb since there's so much..

Rich



DRAFT 0.9.15 release notes

new features:
- support for mixing IPv4 and v6 nameserver addresses in resolv.conf
- RFC 3678 multicast structures/macros in netinet/in.h
- putspent and fgetspent functions (shadow password API)
- timef function (obsolete, removed in POSIX 2008)
- semtimedop syscall (Linux-specific sysvipc extension)
- drem and finite functions (obsolete BSD functions)
- getloadavg function (non-standard)
- libc.so now stores and prints its version information
- expose constants for new Linux features including O_TMPFILE

bugs fixed:
- buffer overflow in mbsrtowcs
- clobbering of gr_name in getgrnam_r and getgrgid_r
- execle ignoring the environment argument
- setenv crash on malloc failure
- failure of malloc to set errno when failing to extend heap
- incorrect errno value from getcwd with zero size
- spurious failure in faccessat with AT_EACCESS flag with suid/sgid programs
- several fd leaks due to missing close-on-exec flag
- misspellings/typos in macro names in several headers
- incorrect failure return value in inet_pton
- various numeric ip address parsing and validation fixes
- namespace conformance issues in several headers
- minor header issues
- zombie processes left by faccessat with AT_EACCESS
- timezone file parser failing/crashing on 64-bit archs
- timezone path search was only trying first path
- incorrect handling of excessive-length TZ environment strings
- timezone file loading was wrongly enforcing O_NOFOLLOW/rejecting symlinks
- iswspace was wrongly returning true for the null character
- various bugs in wordexp
- putgrent could write corrupt lines after write failures
- dn_expand misinterpreted in-packet offsets greater than 255
- spurious strftime/wcsftime failure on len+1==bufsize case
- incorrect underflow flag in fma corner cases
- log*(0) wrongly returned +inf in downward-rounding mode

i386-specific bugs fixed:
- failure of fesetround to set sse rounding mode
- floating point limit constants interpreted wrong due to excess precision

powerpc-specific bugs fixed:
- broken thread pointer access when compiled with clang

strict conformance issues:
- NULL definition re-aligned with POSIX (requires (void *) cast)
- alignment of math.h is* comparison functions with C11 annex F requirements