put an end to LINE_MAX issues

for some reason, getting this macro is really hard across platforms,
requiring either different feature test macros or even the right order
of included headers, and its usage caused several build failures in the
past. fix it once and for all by just using 1024 as max line length if
the macro can't be retrieved.

closes #382

src/conf.c

@@ -40,6 +40,12 @@
 #include "basicauth.h"
 #include "conf-tokens.h"
 
+#ifdef LINE_MAX
+#define TP_LINE_MAX LINE_MAX
+#else
+#define TP_LINE_MAX 1024
+#endif
+
 /*
  * The configuration directives are defined in the structure below.  Each
  * directive requires a regular expression to match against, and a
@@ -409,7 +415,7 @@ static int check_match (struct config_s *conf, const char *line,
  */
 static int config_parse (struct config_s *conf, FILE * f)
 {
-        char buffer[LINE_MAX], *p, *q, c;
+        char buffer[TP_LINE_MAX], *p, *q, c;
         const struct config_directive_entry *e;
         unsigned long lineno = 1;