Use placeholder for standalone mode if needed

armsrc/Makefile

@@ -77,7 +77,7 @@ endif
 # Generic standalone Mode injection of source code
 
 
-SRC_STANDALONE =
+SRC_STANDALONE = placeholder.c
 # WITH_STANDALONE_LF_ICERUN
 ifneq (,$(findstring WITH_STANDALONE_LF_ICERUN,$(APP_CFLAGS)))
 	SRC_STANDALONE = lf_icerun.c

armsrc/Standalone/placeholder.c

@@ -0,0 +1,9 @@
+#include "standalone.h" // standalone definitions
+#include "apps.h" // debug statements
+
+void ModInfo(void) {
+    DbpString("   No standalone mode present");
+}
+
+void RunMod() {
+}

armsrc/appmain.c

@@ -1549,16 +1549,8 @@ void  __attribute__((noreturn)) AppMain(void) {
             /*
             * So this is the trigger to execute a standalone mod.  Generic entrypoint by following the standalone/standalone.h headerfile
             * All standalone mod "main loop" should be the RunMod() function.
-            * Since the standalone is either LF or HF, the somewhat bisarr defines below exists.
             */
-#if defined (WITH_LF) && ( defined (WITH_STANDALONE_LF_SAMYRUN) || defined (WITH_STANDALONE_LF_HIDBRUTE) || defined (WITH_STANDALONE_LF_PROXBRUTE) )
             RunMod();
-#endif
-
-#if defined (WITH_ISO14443a) && ( defined (WITH_STANDALONE_HF_YOUNG) || defined(WITH_STANDALONE_HF_COLIN) || defined(WITH_STANDALONE_HF_MATTYRUN) || defined(WITH_STANDALONE_HF_BOG) )
-            RunMod();
-#endif
-
         }
     }
 }