tgranular2vtu.c: fix compile warning on non BSD systems - granular - granular dynamics simulation
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       ---
 (DIR) commit aac541cd4dac892c59105c80c8aa2e2ff9d422c8
 (DIR) parent b24ca7409f3bc811c3a2240d3d8261e2c060d557
 (HTM) Author: Anders Damsgaard <anders@adamsgaard.dk>
       Date:   Thu, 25 Mar 2021 15:53:41 +0100
       
       granular2vtu.c: fix compile warning on non BSD systems
       
       Diffstat:
         M granular2vtu.c                      |       3 +++
       
       1 file changed, 3 insertions(+), 0 deletions(-)
       ---
 (DIR) diff --git a/granular2vtu.c b/granular2vtu.c
       t@@ -1,3 +1,6 @@
       +#ifndef __OpenBSD__
       +#define  _POSIX_C_SOURCE 200809L
       +#endif
        #include <unistd.h>
        #include <stdio.h>
        #include <stdlib.h>