mail: Remove regex match limitation from the BeOS days.

It was still enabled on 32-bit x86...

src/add-ons/mail_daemon/inbound_filters/match_header/StringMatcher.cpp

@@ -103,16 +103,6 @@ bool StringMatcher::SetPattern(const char * str, bool isSimple)
 bool
 StringMatcher::Match(const char *str) const
 {
-#ifdef __INTEL__
-	char buffer[1024];
-	if (strlen(str) > 1024) {
-		// internal Be regex seems to be broken with strings larger than a certain size :-/
-		memcpy(buffer, str, 1023);
-		buffer[1023] = '\0';
-		str = buffer;
-	}
-#endif
-
 	if (_regExpValid == false)
 		return false;