macOS generated tile build fix

sys/unix/hints/macOS.500

@@ -282,7 +282,9 @@ USE_XPM=1
 USE_PNG=1
 WINX11LIB = -lXaw -lXmu -lXext -lXt -lX11
 VARDATND0 += x11tiles NetHack.ad pet_mark.xbm pilemark.xbm
+ifndef CROSSCOMPILE
 GENTILEOFILE = $(SRCDIR)/tile.o
+endif
 # -x: if built without dodlb, some versions of mkfontdir think *.lev are fonts
 POSTINSTALL += bdftopcf win/X11/nh10.bdf > $(HACKDIR)/nh10.pcf; ( cd $(HACKDIR); mkfontdir -x .lev );
 # separate from CFLAGS so that we don't pass it to every file
@@ -310,6 +312,9 @@ endif	# WANT_WIN_X11
 ifdef WANT_WIN_QT
 LINK = $(CXX)
 ifdef WANT_WIN_QT5
+ifndef CROSSCOMPILE
+GENTILEOFILE = $(SRCDIR)/tile.o
+endif
 # Qt5 requires C++11
 QTCXXFLAGS += $(sort $(shell PKG_CONFIG_PATH=$(QTDIR)/lib/pkgconfig \
 		pkg-config Qt5Gui Qt5Widgets Qt5Multimedia --cflags))