Explicitly include time.h to fix building the examples

Author: victorhora

CHANGES

@@ -1,6 +1,8 @@
 v3.0.3 - YYYY-MMM-DD (to be released)
 -------------------------------------
 
+ - Fix OpenBSD build
+   [Issue #1841 - @victorhora, @zimmerle, @juanfra684]
  - Fix parser to support GeoLookup with MaxMind
    [Issue #1884, #1895 - @victorhora, @everping]
  - parser: Fix simple quote setvar in the end of the line

examples/multiprocess_c/multi.c

@@ -22,6 +22,7 @@
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/wait.h>
+#include <sys/time.h>
 
 #define FORKS 5
 #define REQUESTS_PER_PROCESS 100