support WANT_ASAN=1 on make command line in linux.370 and macOS.370

When the address sanitizer is in use for gcc, clang, or visual studio,
(-fsanitize=address) define the NetHack preprocessor symbol USING_ADDRESS_SANITIZER.

sys/unix/hints/macOS.370

@@ -72,6 +72,10 @@ endif   # WANT_WIN_QT
 
 #-INCLUDE multiw-3.370
 
+ifeq "$(NEED_ASAN)" "1"
+LFLAGS +=-fsanitize=address
+endif
+
 # NetHack sources control
 NHCFLAGS+=-DDLB
 NHCFLAGS+=-DHACKDIR=\"$(HACKDIR)\"