[c-host] added linux platform stubs

c-host/Makefile

@@ -23,6 +23,8 @@ ifdef OS
     DLLS   += dll/libd3d11.a
     OBJS   += capture/dxgi.o
   endif
+else
+  OBJS += linux/platform.o
 endif
 
 all: $(OBJS) $(DLLS)

c-host/linux/platform.c

@@ -0,0 +1,45 @@
+/*
+Looking Glass - KVM FrameRelay (KVMFR) Client
+Copyright (C) 2017-2019 Geoffrey McRae <geoff@hostfission.com>
+https://looking-glass.hostfission.com
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; either version 2 of the License, or (at your option) any later
+version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include "app.h"
+#include "debug.h"
+
+int main(int argc, char * argv[])
+{
+  int result = app_main();
+  os_shmemUnmap();
+  return result;
+}
+
+unsigned int os_shmemSize()
+{
+  // TODO
+  return 0;
+}
+
+bool os_shmemMmap(void **ptr)
+{
+  // TODO
+  return false;
+}
+
+void os_shmemUnmap()
+{
+  // TODO
+}