missing.h: build fix

* include/ruby/missing.h: include time.h and sys/time.h iff needed,
  but excepct for sys/time.h on linux to get rid of glibc bug.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39781 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

include/ruby/missing.h

@@ -25,12 +25,14 @@ extern "C" {
 #include RUBY_EXTCONF_H
 #endif
 
+#if !defined(HAVE_STRUCT_TIMEVAL) || !defined(HAVE_STRUCT_TIMESPEC)
 #if defined(HAVE_TIME_H)
 # include <time.h>
 #endif
-#if defined(HAVE_SYS_TIME_H)
+#if defined(HAVE_SYS_TIME_H) && !defined(__linux__)
 # include <sys/time.h>
 #endif
+#endif
 
 #if !defined(HAVE_STRUCT_TIMEVAL)
 struct timeval {