added math.h import where needed

src/obidms.c

@@ -21,6 +21,7 @@
 #include <unistd.h>
 #include <libgen.h>   /* <EC> : Added July 28th 2017 to include basename */
 #include <sys/mman.h>
+#include <math.h>
 
 #include "obidms.h"
 #include "obierrno.h"

src/obiview.c

@@ -16,6 +16,7 @@
 #include <fcntl.h>
 #include <sys/mman.h>
 #include <inttypes.h>
+#include <math.h>
 
 
 #include "obiview.h"