build release script: add dxe3gen.exe to dos package

Author: jayrm

contrib/release/build.sh

@@ -441,6 +441,7 @@ EOF
 
 	mkdir -p fbc/bin/dos
 	cp bin/ar.exe bin/as.exe bin/gdb.exe bin/gprof.exe bin/ld.exe fbc/bin/dos/
+	cp bin/dxe3gen.exe fbc/bin/dos/
 	cp lib/crt0.o lib/gcrt0.o lib/libdbg.a lib/libemu.a lib/libm.a fbc/lib/dos/
 	cp lib/libstdcxx.a fbc/lib/dos/libstdcx.a
 	cp lib/libsupcxx.a fbc/lib/dos/libsupcx.a