Add support for fat Darwin builds...

Using FAT=1 one the make command-line

3rdp/build/GNUmakefile

@@ -196,10 +196,18 @@ ifeq ($(os),win64)
 else
 ifdef MINGW32
 	$(QUIET)cd $(CRYPT_SRC) && env - PATH="$(PATH)" CC="$(CC)" AR="$(AR)" RANLIB="$(RANLIB)" make target-mingw
+else
+ifeq ($(os),darwin)
+ifdef FAT
+	$(QUIET)cd $(CRYPT_SRC) && env - PATH="$(PATH)" CC="$(CC)" AR="$(AR)" RANLIB="$(RANLIB)" make BUILDOPTS="-arch x86_64 -arch arm64"
+else
+	$(QUIET)cd $(CRYPT_SRC) && env - PATH="$(PATH)" CC="$(CC)" AR="$(AR)" RANLIB="$(RANLIB)" make
+endif
 else
 	$(QUIET)cd $(CRYPT_SRC) && env - PATH="$(PATH)" CC="$(CC)" AR="$(AR)" RANLIB="$(RANLIB)" make
 endif
 endif
+endif
 endif
 	$(QUIET)cp $(CRYPT_SRC)/libcl.a $(CRYPT_IDIR)
 	$(QUIET)cp $(CRYPT_SRC)/cryptlib.h $(CRYPT_IDIR)

src/build/Common.gmake

@@ -253,6 +253,10 @@ ifndef win
 endif
 
 ifeq ($(os),darwin)
+ ifdef FAT
+  CFLAGS += -arch x86_64 -arch arm64
+  LDFLAGS += -arch x86_64 -arch arm64
+ endif
  ifeq ("$(machine_uname)","")
   ifeq ($(shell sysctl hw.optional.x86_64),hw.optional.x86_64: 1)
    machine_uname := x86_64