contrib: libshout: Apply a patch to avoid implicit declarations of gettimeofday

This patch has been sent upstream at
https://gitlab.xiph.org/xiph/icecast-common/-/merge_requests/2
but hasn't been acted upon there yet.

When building for a mingw target, HAVE_GETTIMEOFDAY is defined
(as the gettimeofday function was found), but the #ifdef _WIN32 #else
block never tried to include <sys/time.h> (which provides the
declaration) and/or <time.h> for such targets. This caused
gettimeofday to be used without a prior declaration.

This has been visible as an easily overlooked warning, but Clang 15
changed this into a fatal error by default, when building in C99
mode (or newer). [1] (While Clang 15 still is under development, this
may still change before it's released, but the warning is valid
in any case.)

Decouple including of those headers from the #ifdef _WIN32 #else
block and just check their corresponding availability defines.

[1] 7d644e1215

contrib/src/shout/rules.mak

@@ -28,6 +28,7 @@ libshout: libshout-$(SHOUT_VERSION).tar.gz .sum-shout
 	$(APPLY) $(SRC)/shout/no-examples.patch
 	$(APPLY) $(SRC)/shout/no-force-libwsock.patch
 	$(APPLY) $(SRC)/shout/should-win32-ws2tcpip.patch
+	$(APPLY) $(SRC)/shout/win32-gettimeofday.patch
 	$(call pkg_static,"shout.pc.in")
 	$(UPDATE_AUTOCONFIG)
 	$(MOVE)

contrib/src/shout/win32-gettimeofday.patch

@@ -0,0 +1,22 @@
+--- libshout/src/common/timing/timing.c.orig	2022-04-21 15:00:39.729501137 +0300
++++ libshout/src/common/timing/timing.c	2022-04-21 15:00:43.565527749 +0300
+@@ -37,6 +37,9 @@
+ #include <mmsystem.h>
+ #include <winsock2.h>
+ #else
++#include <unistd.h>
++#endif
++
+ #ifdef TIME_WITH_SYS_TIME
+ #  include <sys/time.h>
+ #  include <time.h>
+@@ -48,9 +51,6 @@
+ #  endif
+ #endif
+ 
+-#include <unistd.h>
+-#endif
+-
+ #ifdef HAVE_SYS_SELECT_H
+ #include <sys/select.h>
+ #endif