New plugin interface.

Make sure pp_spi_init() is exported where plugins.c can see it.

src/elumens.cc

@@ -23,6 +23,10 @@ extern "C" {
 }
 #endif /*!GLX_VERSION_1_2*/
 
+extern "C" {
+  extern void pp_spi_init();
+}
+
 struct spichan {
   int code;		/* SPI_1C_FRONT, etc. */
   int pfcode;		/* SPI_PF_1_CHAN, etc. */
@@ -120,7 +124,7 @@ int pp_spi_postdraw( Fl_Gview *view, int passno ) {
   return 0;
 }
 
-int pp_spi_parse_args( struct stuff **, int argc, char *argv[], void * ) {
+int pp_spi_parse_args( struct stuff **, int argc, char *argv[], char *fname, void * ) {
   if(argc < 1 || (strncmp(argv[0], "elumens", 3)
 			&& strcmp(argv[0], "spi")))
     return 0;