patch 9.0.0694: no native sound support on Mac OS

Problem:    No native sound support on Mac OS.
Solution:   Add sound support for Mac OS. (Yee Cheng Chin, closes #11274)
diff --git a/src/configure.ac b/src/configure.ac
index a588ad6..e203fde 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -4553,7 +4553,7 @@
   AC_MSG_CHECKING([whether we need macOS frameworks])
   if test "$MACOS_X_DARWIN" = "yes"; then
     if test "$features" = "tiny"; then
-      dnl Since no FEAT_CLIPBOARD, no longer need for os_macosx.m.
+      dnl Since no FEAT_CLIPBOARD or FEAT_SOUND, no need for os_macosx.m.
       OS_EXTRA_SRC=`echo "$OS_EXTRA_SRC" | sed -e 's+os_macosx.m++'`
       OS_EXTRA_OBJ=`echo "$OS_EXTRA_OBJ" | sed -e 's+objects/os_macosx.o++'`
       AC_MSG_RESULT([yes, we need CoreServices])