wrapWatcom: Fix file identification checks

                  wcl -bcl=dos -fe=dos test.c

                  echo "Test file format"

                  file ./linux | grep "32-bit" | grep "Linux"

                  file ./nt.exe | grep "PE32" | grep "Windows"

                  file ./dos4g.exe | grep "MS-DOS" | grep "LE executable"

                  file ./windows.exe | grep "MS-DOS" | grep "Windows 3.x"

                  file ./dos.exe | grep "MS-DOS" | grep -v "LE" | grep -v "Windows 3.x"

                  file ./linux

                  file ./linux | grep "32-bit" | grep -q "Linux"

                  file ./nt.exe

                  file ./nt.exe | grep "PE32" | grep -q "Windows"

                  file ./dos4g.exe

                  file ./dos4g.exe | grep "MS-DOS" | grep -q "executable, LE"

                  file ./windows.exe

                  file ./windows.exe | grep "MS-DOS" | grep -q "Windows 3.00"

                  file ./dos.exe

                  file ./dos.exe | grep "MS-DOS" | grep -v "LE" | grep -qv "Windows 3."

                  touch $out

                '';

          };