be more consistent with CROSS_TO_target macro names for cross-compiles

-DCROSS_TO_MSDOS	msdos cross-compile (djgpp cross-compiler)
-DCROSS_TO_AMIGA	Amiga cross-compile
-DCROSS_TO_WASM		wasm cross-compile (emscripten)

sys/share/pcmain.c

@@ -754,7 +754,7 @@ char *str;
 }
 #endif /* EXEPATH */
 
-#ifdef AMIGA_CROSS
+#ifdef CROSS_TO_AMIGA
 void msmsg
 VA_DECL(const char *, fmt)
 {

sys/share/pcsys.c

@@ -12,10 +12,10 @@
 
 #include <ctype.h>
 #include <fcntl.h>
-#if !defined(MSDOS) && !defined(WIN_CE) && !defined(AMIGA_CROSS)
+#if !defined(MSDOS) && !defined(WIN_CE) && !defined(CROSS_TO_AMIGA)
 #include <process.h>
 #endif
-#if defined(__GO32__) || defined(AMIGA_CROSS)
+#if defined(__GO32__) || defined(CROSS_TO_AMIGA)
 #define P_WAIT 0
 #define P_NOWAIT 1
 #endif
@@ -154,7 +154,7 @@ const char *str;
 #ifdef TOS
     msmsg("Hit <Return> %s.", str);
 #else
-#ifdef AMIGA_CROSS
+#ifdef CROSS_TO_AMIGA
     (void) printf("Hit <Enter> %s.", str);
 #else
     msmsg("Hit <Enter> %s.", str);

sys/unix/hints/include/cross-pre.2020

@@ -163,7 +163,7 @@ override TARGET_AR = $(TOOLTOP1)/i586-pc-msdosdjgpp-gcc-ar
 override TARGET_STUBEDIT = ../lib/djgpp/i586-pc-msdosdjgpp/bin/stubedit
 override TARGET_CFLAGS = -c -O -I../include -I../sys/msdos -I../win/share \
 	$(LUAINCL) -DDLB $(PDCURSESDEF) \
-	-DUSE_TILES -DCROSSCOMPILE -DCROSSCOMPILE_TARGET
+	-DUSE_TILES -DCROSSCOMPILE -DCROSSCOMPILE_TARGET -DCROSS_TO_MSDOS
 override TARGET_CXXFLAGS = $(TARGET_CFLAGS)
 override TARGET_LINK = $(TOOLTOP1)/i586-pc-msdosdjgpp-gcc
 override TARGET_LFLAGS=
@@ -235,9 +235,9 @@ override TARGET_STUBEDIT=
 override TARGET_CFLAGS = -c -O $(TOOLARCH) \
 	-I../include -I../outdated/include \
 	-I../outdated/sys/amiga -I../win/share \
-	$(LUAINCL) -DAMIGA -DAMIGA_CROSS $(PDCURSESDEF) \
-	-DUSE_TILES -DCROSSCOMPILE -DCROSSCOMPILE_TARGET \
-	-DAMIGA_VERSION_STRING=\""VER: NetHack 3.7.0 \(12.13.2020)\""
+	$(LUAINCL) -DAMIGA -DUSE_TILES $(PDCURSESDEF) \
+	-DCROSSCOMPILE -DCROSSCOMPILE_TARGET -DCROSS_TO_AMIGA \
+	-DAMIGA_VERSION_STRING=\""VER: NetHack 3.7.0\""
 override TARGET_CXXFLAGS = $(TARGET_CFLAGS)
 ifeq "$(REGEXOBJ)" "$(TARGETPFX)cppregex.o"
 override TARGET_LINK = $(TARGET_CXX)