Fix async examples build for asn_orig.c

Add settings.h include before the compile guard in asn_orig.c so
WOLFSSL_IGNORE_FILE_WARN is available when compiled separately.
Add -Wno-pedantic for asn_orig.c in async examples Makefile to
suppress empty translation unit warning.

Author: dgarske

examples/async/Makefile

@@ -67,6 +67,7 @@ $(OBJDIR)/wolfcrypt/src/fipsv2.o: CFLAGS += -Wno-pedantic
 $(OBJDIR)/wolfcrypt/src/selftest.o: CFLAGS += -Wno-pedantic
 $(OBJDIR)/wolfcrypt/src/wolfcrypt_first.o: CFLAGS += -Wno-pedantic
 $(OBJDIR)/wolfcrypt/src/wolfcrypt_last.o: CFLAGS += -Wno-pedantic
+$(OBJDIR)/wolfcrypt/src/asn_orig.o: CFLAGS += -Wno-pedantic
 
 clean:
 	$(RM) -r $(OBJDIR) $(TARGETS)

wolfcrypt/src/asn_orig.c

@@ -22,9 +22,14 @@
 /*
  * Original (non-template) ASN.1 implementations.
  * This file is included from asn.c when building without WOLFSSL_ASN_TEMPLATE.
- * It does not need to be compiled as a separate file.
+ * It must not be compiled as a separate translation unit.
  */
 
+#ifdef HAVE_CONFIG_H
+    #include <config.h>
+#endif
+#include <wolfssl/wolfcrypt/settings.h>
+
 #ifndef WOLFSSL_ASN_ORIG_INCLUDED
     #ifndef WOLFSSL_IGNORE_FILE_WARN
         #warning asn_orig.c does not need to be compiled separately from asn.c