libevent2: Don't build tests and samples

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This reduces build time significantly.

Signed-off-by: Eneas U de Queiroz <cote2004-github@yahoo.com>

package/libs/libevent2/patches/0002-Makefile.am-omit-building-sample-and-test.patch

@@ -0,0 +1,13 @@
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -143,8 +143,8 @@ CLEANFILES=
+ DISTCLEANFILES=
+ BUILT_SOURCES =
+ include include/include.am
+-include sample/include.am
+-include test/include.am
++#include sample/include.am
++#include test/include.am
+ 
+ if BUILD_WIN32
+