add missing header when compiled without GDAL and PostgreSQL support

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@58295 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/imagery/iscatt_core.c

@@ -13,6 +13,7 @@
 
 #include <stdio.h>
 #include <string.h>
+#include <math.h>
 
 #include <grass/gis.h>
 #include <grass/vector.h>

vector/v.to.points/write.c

@@ -1,3 +1,5 @@
+#include <math.h>
+
 #include <grass/vector.h>
 #include <grass/glocale.h>