message: build as a "GUI" .exe on Windows
diff: @@ -4,7 +4,7 @@ if OS_LINUX
  AM_LDFLAGS += -Wl,-z,relro -Wl,-z,now -Wl,-z,noexecstack -Wl,-z,noexecheap -Wl,-z,nodlopen -Wl,-z,nodump
  else
  if OS_WINDOWS_CROSSCOMPILE
  -AM_LDFLAGS += -Wl,--dynamicbase -Wl,--nxcompat
  +AM_LDFLAGS += -Wl,--dynamicbase -Wl,--nxcompat -Wl,--subsystem,windows
  endif
  endif
  