patch 8.1.1565: MS-Windows: no sound support

Problem:    MS-Windows: no sound support.
Solution:   Add sound support for MS-Windows. (Yasuhiro Matsumoto, Ken Takata,
            closes #4522)
diff --git a/src/Make_cyg_ming.mak b/src/Make_cyg_ming.mak
index f479812..3c0c92b 100644
--- a/src/Make_cyg_ming.mak
+++ b/src/Make_cyg_ming.mak
@@ -106,6 +106,13 @@
 TERMINAL=no
 endif
 
+# Set to yes to enable sound support.
+ifneq ($(findstring $(FEATURES),BIG HUGE),)
+SOUND=yes
+else
+SOUND=no
+endif
+
 ifndef CTAGS
 # this assumes ctags is Exuberant ctags
 CTAGS = ctags -I INIT+ --fields=+S
@@ -633,6 +640,10 @@
 	libvterm/src/vterm_internal.h
 endif
 
+ifeq ($(SOUND),yes)
+DEFINES += -DFEAT_SOUND
+endif
+
 # DirectWrite (DirectX)
 ifeq ($(DIRECTX),yes)
 # Only allow DirectWrite for a GUI build.
@@ -849,6 +860,10 @@
 	$(OUTDIR)/vterm.o
 endif
 
+ifeq ($(SOUND),yes)
+OBJ += $(OUTDIR)/sound.o
+endif
+
 # Include xdiff
 OBJ +=  $(OUTDIR)/xdiffi.o \
 	$(OUTDIR)/xemit.o \
@@ -957,6 +972,10 @@
 DEFINES+=-DDYNAMIC_ICONV
 endif
 
+ifeq (yes, $(SOUND))
+LIB += -lwinmm
+endif
+
 ifeq (yes, $(USE_STDCPLUS))
 LINK = $(CXX)
  ifeq (yes, $(STATIC_STDCPLUS))