Tests: allow run with valgrind

tests/bpv_limit.sh

@@ -17,7 +17,7 @@
 
 REDIRECT=/dev/null
 
-./bpv_limit ${data_dir}/regular_latlon_surface.grib2
+$EXEC ./bpv_limit ${data_dir}/regular_latlon_surface.grib2
 
 # TODO: grib1 does not work yet. bpv=64 but decode does not fail as expected
 #for file in ${data_dir}/regular_latlon_surface.grib?; do 

tests/grib_optimize_scaling.sh

@@ -15,4 +15,4 @@ if [ $ECCODES_ON_WINDOWS -eq 1 ]; then
     exit 0
 fi
 
-exec $test_dir/grib_optimize_scaling
+$EXEC $test_dir/grib_optimize_scaling

tests/grib_sh_ieee64.sh

@@ -15,4 +15,4 @@ if [ $ECCODES_ON_WINDOWS -eq 1 ]; then
     exit 0
 fi
 
-exec $test_dir/grib_sh_ieee64
+$EXEC $test_dir/grib_sh_ieee64

tests/unit_tests.sh

@@ -10,4 +10,4 @@
 
 
 . ./include.sh
-exec ${test_dir}/unit_tests
+$EXEC ${test_dir}/unit_tests