Add configure check for sys/time.h

Originally committed to SVN as r4529.

aegisub/configure.in

@@ -341,6 +341,8 @@ AX_OPENMP([], [with_openmp="no"])
 AM_CONDITIONAL([HAVE_OPENMP], [test "$with_openmp" != "no"])
 AC_SUBST(OPENMP_CXXFLAGS)
 
+AC_CHECK_HEADERS([sys/time.h])
+
 
 ##############################
 # Program Support and Features

aegisub/libaegisub/include/libaegisub/types.h

@@ -19,17 +19,15 @@
 /// @ingroup libaegisub
 
 #ifndef LAGI_PRE
+
+#ifdef HAVE_SYS_TIME_H
+#  include <sys/time.h>
+#else
+#  include <time.h>
+#endif
+
 #endif // LAGI_PRE
 
-#ifdef _WIN32
-#include <time.h>
-
-#else // Unix / OSX
-#include <sys/time.h>
-
-#endif // if _WIN32
-
-
 #pragma once
 
 namespace agi {

aegisub/libaegisub/lagi_pre.h

@@ -8,8 +8,11 @@
 #include <stdint.h>
 #include <string.h>
 #include <sys/stat.h>
-#include <time.h>
-#include <sys/time.h>
+#ifdef HAVE_SYS_TIME_H
+#  include <sys/time.h>
+#else
+#  include <time.h>
+#endif
 
 // Windows C
 #ifdef _WIN32