Makefile: add build script for asn1 parsers

This rule will be used to build x509 and pkcs7 parsers.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
diff --git a/Makefile b/Makefile
index 0ee0c70..b6a091a 100644
--- a/Makefile
+++ b/Makefile
@@ -1957,6 +1957,7 @@
 		-o -name '*.ko.*' -o -name '*.su' -o -name '*.pyc' \
 		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
 		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
+		-o -name '*.asn1.[ch]' \
 		-o -name '*.symtypes' -o -name 'modules.order' \
 		-o -name modules.builtin -o -name '.tmp_*.o.*' \
 		-o -name 'dsdt.aml' -o -name 'dsdt.asl.tmp' -o -name 'dsdt.c' \