Global rename *zs[n]printf -> *s[n]zprintf.
* lib/aszprintf.c: Renamed from lib/azsprintf.c.
* lib/c-aszprintf.c: Renamed from lib/c-azsprintf.c.
* lib/c-vaszprintf.c: Renamed from lib/c-vazsprintf.c.
* lib/c-vsnzprintf.c: Renamed from lib/c-vzsnprintf.c.
* lib/c-snzprintf.c: Renamed from lib/c-zsnprintf.c.
* lib/vaszprintf.c: Renamed from lib/vazsprintf.c.
* lib/vsnzprintf.c: Renamed from lib/vzsnprintf.c.
* lib/vszprintf.c: Renamed from lib/vzsprintf.c.
* lib/snzprintf.c: Renamed from lib/zsnprintf.c.
* lib/szprintf.c: Renamed from lib/zsprintf.c.
* tests/test-c-vaszprintf-gnu.c: Renamed from
tests/test-c-vazsprintf-gnu.c.
* tests/test-c-vaszprintf-gnu.sh: Renamed from
tests/test-c-vazsprintf-gnu.sh.
* tests/test-c-vsnzprintf-gnu.c: Renamed from
tests/test-c-vzsnprintf-gnu.c.
* tests/test-c-vsnzprintf-gnu.sh: Renamed from
tests/test-c-vzsnprintf-gnu.sh.
* tests/test-c-snzprintf-gnu.c: Renamed from
tests/test-c-zsnprintf-gnu.c.
* tests/test-c-snzprintf-gnu.sh: Renamed from
tests/test-c-zsnprintf-gnu.sh.
* tests/test-vaszprintf-gnu.c: Renamed from tests/test-vazsprintf-gnu.c.
* tests/test-vaszprintf-gnu.h: Renamed from tests/test-vazsprintf-gnu.h.
* tests/test-vaszprintf-posix.c: Renamed from
tests/test-vazsprintf-posix.c.
* tests/test-vsnzprintf-gnu.c: Renamed from tests/test-vzsnprintf-gnu.c.
* tests/test-vsnzprintf-posix.c: Renamed from
tests/test-vzsnprintf-posix.c.
* tests/test-vszprintf-gnu.c: Renamed from tests/test-vzsprintf-gnu.c.
* tests/test-vszprintf-posix.c: Renamed from
tests/test-vzsprintf-posix.c.
* tests/test-snzprintf-gnu.c: Renamed from tests/test-zsnprintf-gnu.c.
* tests/test-snzprintf-gnu.h: Renamed from tests/test-zsnprintf-gnu.h.
* tests/test-snzprintf-posix.c: Renamed from
tests/test-zsnprintf-posix.c.
* tests/test-snzprintf-posix.h: Renamed from
tests/test-zsnprintf-posix.h.
* tests/test-szprintf-gnu.c: Renamed from tests/test-zsprintf-gnu.c.
* tests/test-szprintf-gnu.h: Renamed from tests/test-zsprintf-gnu.h.
* tests/test-szprintf-posix.c: Renamed from tests/test-zsprintf-posix.c.
* tests/test-szprintf-posix.h: Renamed from tests/test-zsprintf-posix.h.
* modules/c-vaszprintf: Renamed from modules/c-vazsprintf.
* modules/c-vaszprintf-gnu: Renamed from modules/c-vazsprintf-gnu.
* modules/c-vaszprintf-gnu-tests: Renamed from
modules/c-vazsprintf-gnu-tests.
* modules/c-vsnzprintf: Renamed from modules/c-vzsnprintf.
* modules/c-vsnzprintf-gnu: Renamed from modules/c-vzsnprintf-gnu.
* modules/c-vsnzprintf-gnu-tests: Renamed from
modules/c-vzsnprintf-gnu-tests.
* modules/c-snzprintf: Renamed from modules/c-zsnprintf.
* modules/c-snzprintf-gnu: Renamed from modules/c-zsnprintf-gnu.
* modules/c-snzprintf-gnu-tests: Renamed from
modules/c-zsnprintf-gnu-tests.
* modules/vaszprintf: Renamed from modules/vazsprintf.
* modules/vaszprintf-gnu: Renamed from modules/vazsprintf-gnu.
* modules/vaszprintf-gnu-tests: Renamed from
modules/vazsprintf-gnu-tests.
* modules/vaszprintf-posix: Renamed from modules/vazsprintf-posix.
* modules/vaszprintf-posix-tests: Renamed from
modules/vazsprintf-posix-tests.
* modules/vsnzprintf: Renamed from modules/vzsnprintf.
* modules/vsnzprintf-gnu: Renamed from modules/vzsnprintf-gnu.
* modules/vsnzprintf-gnu-tests: Renamed from
modules/vzsnprintf-gnu-tests.
* modules/vsnzprintf-posix: Renamed from modules/vzsnprintf-posix.
* modules/vsnzprintf-posix-tests: Renamed from
modules/vzsnprintf-posix-tests.
* modules/vszprintf: Renamed from modules/vzsprintf.
* modules/vszprintf-gnu: Renamed from modules/vzsprintf-gnu.
* modules/vszprintf-gnu-tests: Renamed from modules/vzsprintf-gnu-tests.
* modules/vszprintf-posix: Renamed from modules/vzsprintf-posix.
* modules/vszprintf-posix-tests: Renamed from
modules/vzsprintf-posix-tests.
* modules/snzprintf: Renamed from modules/zsnprintf.
* modules/snzprintf-gnu: Renamed from modules/zsnprintf-gnu.
* modules/snzprintf-gnu-tests: Renamed from modules/zsnprintf-gnu-tests.
* modules/snzprintf-posix: Renamed from modules/zsnprintf-posix.
* modules/snzprintf-posix-tests: Renamed from
modules/zsnprintf-posix-tests.
* modules/szprintf: Renamed from modules/zsprintf.
* modules/szprintf-gnu: Renamed from modules/zsprintf-gnu.
* modules/szprintf-gnu-tests: Renamed from modules/zsprintf-gnu-tests.
* modules/szprintf-posix: Renamed from modules/zsprintf-posix.
* modules/szprintf-posix-tests: Renamed from
modules/zsprintf-posix-tests.
All function names updated.
* lib/stdio.in.h, m4/stdio_h.m4, modules/stdio: Update module indicator
names.