yaz: fix -Wimplicit-function-declaration

srcpkgs/yaz/patches/implicit-function-decl.patch

@@ -0,0 +1,20 @@
+--- a/src/record_conv.c
++++ b/src/record_conv.c
+@@ -11,6 +11,7 @@
+ #include <config.h>
+ #endif
+ 
++#include <stdlib.h>
+ #include <string.h>
+ #include <yaz/log.h>
+ #include <yaz/yaz-iconv.h>
+--- a/src/xmlquery.c
++++ b/src/xmlquery.c
+@@ -10,6 +10,7 @@
+ #endif
+ 
+ #include <stdio.h>
++#include <stdlib.h>
+ #include <string.h>
+ #include <assert.h>
+