detect-environment: Remove call to function fatal

The function "fatal" is not defined in this script. So it may not be
available.

Ticket: ENT-12600
Signed-off-by: Lars Erik Wik <lars.erik.wik@northern.tech>

Author: larsewi

build-scripts/detect-environment

@@ -341,7 +341,8 @@ detect_tools()
     then
         export MAKE
     else
-        fatal "GNU Make not found"
+        echo "Error: GNU Make not found"
+        exit 42
     fi
 
     FUSER=$(func_whereis fuser)