mk-symfiles.sh improvent

to filter out #defines as intended.
Thanks Zero King

ChangeLog

@@ -1,3 +1,7 @@
+* 2019-01-??: Version 1.5.1
+  * Issue #415: Filter out #defines etc. when creating
+    symbols file.  Thanks Zero King
+
 * 2018-12-21: Version 1.5.0
   * RFE getdnsapi/stubby#121 log re-instantiating TLS
     upstreams (because they reached tls_backoff_time) at

src/libgetdns.symbols

@@ -1,7 +1,7 @@
+ * if 
 getdns_address
 getdns_address_sync
 getdns_cancel_callback
-getdns_context_
 getdns_context_config
 getdns_context_create
 getdns_context_create_with_extended_memory_functions

src/mk-symfiles.sh

@@ -3,7 +3,7 @@
 write_symbols() {
 	OUTPUT=$1
 	shift
-	grep 'getdns_[0-9a-zA-Z_]*(' $* | grep -v '^#' | grep -v 'INLINE' | grep -v 'getdns_extra\.h\.in: \* if' \
+	grep -h 'getdns_[0-9a-zA-Z_]*(' $* | grep -v '^#' | grep -v 'INLINE' | grep -v 'getdns_extra\.h\.in: \* if' \
 	| sed -e 's/(.*$//g' -e 's/^.*getdns_/getdns_/g' | LC_ALL=C sort | uniq > $OUTPUT
 }