audio/rezound: improve (and shorten!) one of the patch files

Provide get_timezone_offset() implementation for FreeBSD next
to the glibc-specific code rather than deleting and replacing
the latter.

audio/rezound/files/patch-src_misc_clocks.cpp

@@ -1,23 +1,12 @@
 --- src/misc/clocks.cpp.orig	2013-02-10 06:35:02 UTC
 +++ src/misc/clocks.cpp
-@@ -304,18 +304,8 @@ int get_timezone_offset()
+@@ -303,6 +303,9 @@ int get_timezone_offset()
+ {
  #ifdef __APPLE__
  	int ret = [[NSTimeZone localTimeZone] secondsFromGMT];
- #else
--	tzset();
--
--	// ::timezone's manpage says "Seconds West of GMT", but I found this not to be the case
--	// ::timezone is in the range [-12*3600, 12*3600], but it's sign is opposite what we expect:
--	//   Central Time is +6 hours
--	// We want to return -6 hours for Central, so we translate the range and ensure it's min and max value
--
--
--	int ret = ::timezone;
--
--	// invert sign for our purposes
--	ret = -ret;
++#elif defined(__FreeBSD__)
 +	time_t date = time(NULL);
 +	int ret = localtime(&date)->tm_gmtoff;
- #endif
- 	
- 	// "clamp-and-shift" to convert values outside the appropriate
+ #else
+ 	tzset();
+