stubs to be able to compile on modern amd64

bsp_mib/stubs/CMakeLists.txt

@@ -0,0 +1 @@
+target_sources(${OBSW_NAME} PRIVATE xiphosstub.cpp gpsstub.cpp)

bsp_mib/stubs/xiphosstub.cpp

@@ -0,0 +1,7 @@
+#include "../include/libxiphos.h"
+
+void xsc_boot_copy(xsc_libnor_chip_t boot_chip, xsc_libnor_copy_t boot_copy) {}
+
+xsc_status_t xsc_boot_get_chip_copy(xsc_libnor_chip_t *boot_chip, xsc_libnor_copy_t *boot_copy){
+    return 0;
+}