Bugfix/fix redundant compiler flags (#658)

* Improved GCC compiler flags in ARM, OS, and test builds. Removed redundant flags, and made them consistent across various builds.

* Fixed redundant redeclaration of various functions detected by change in compiler flags.

* Fixed string truncation warning in bip-init detected by change in compiler flags.

* Fixed some set-but-not-used variables by creating dummy functions instead of using macros.

src/bacnet/bacapp.c

@@ -2520,6 +2520,14 @@ bool bacapp_print_value(
 
     return retval;
 }
+#else
+bool bacapp_print_value(
+    FILE *stream, BACNET_OBJECT_PROPERTY_VALUE *object_value)
+{
+    (void)stream;
+    (void)object_value;
+    return false;
+}
 #endif
 
 #ifdef BACAPP_PRINT_ENABLED
@@ -2952,6 +2960,16 @@ bool bacapp_parse_application_data(BACNET_APPLICATION_TAG tag_number,
 
     return status;
 }
+#else
+bool bacapp_parse_application_data(BACNET_APPLICATION_TAG tag_number,
+    char *argv,
+    BACNET_APPLICATION_DATA_VALUE *value)
+{
+    (void)tag_number;
+    (void)argv;
+    (void)value;
+    return false;
+}
 #endif /* BACAPP_PRINT_ENABLED */
 
 /**