autotools, cmake: fix the sys/audioio.h checks.

Reference issue: https://github.com/libsdl-org/SDL/issues/13405.
(cherry picked from commit 74df61530f)

configure.ac

@@ -3869,9 +3869,9 @@ case "$host" in
         if test x$enable_audio = xyes; then
           case $ARCH in
             sysv5|solaris|hpux)
-                dnl Newer Solaris-based systems, like OpenIndiana, don't have this interface anymore. Check for the header first.
-                AC_CHECK_HEADER(audio/audiolib.h,have_sys_audiolib=yes,have_sys_audiolib=no)
-                if test x$have_sys_audiolib = xyes; then
+                # Newer Solaris-based systems, like OpenIndiana, don't have this interface anymore. Check for the header first.
+                AC_CHECK_HEADER(sys/audioio.h, have_sys_audioio_h=yes, have_sys_audioio_h=no)
+                if test x$have_sys_audioio_h = xyes; then
                     AC_DEFINE(SDL_AUDIO_DRIVER_SUNAUDIO, 1, [ ])
                     SOURCES="$SOURCES $srcdir/src/audio/sun/*.c"
                     SUMMARY_audio="${SUMMARY_audio} sun"