Fix compilation with gcc10 which defaults to -fcommon
GCC 10 defaults to -fcommon, so it is no longer allowed to put non
extern variable declarations in .h files otherwise we get linker
errors about conflicting symbols in the .o files.
This commit fixes these linking errors.
static const int interpret_args_as_text = 0;
static const int dump_addr1_as_diff = 0;
+static struct mmt_txt_nvidia_state
+{
+} mmt_txt_nv_state;
+
void txt_memread(struct mmt_read *w, void *state)
{
unsigned char *data = &w->data[0];
