Make scanner portable (works with regular lex)

src/sermon_lexer.l

@@ -9,6 +9,7 @@
 #define LEXPRINT(x...)
 #endif
 %}
+%option noyywrap
 %s HEADER HEADERVAL REFERENCEINTRO REFERENCENAME REFERENCE BLOCK
 WHITESPACE                   [ \t]
 ID                           [A-Za-z_][A-Za-z_0-9]*