check_configtool.sh: don't ignore whitespace entirely.

Instead, any amount of whitespace is treated equally.

Example of a failure not noticed before:

  //#define Z_DIR_PIN  PA_8
  //#define Z_DIR_PINPA_8

config/board.cnc-shield-v3-nucleo.h

@@ -65,8 +65,8 @@
 //#define Y_INVERT_MAX
 //#define Y_INVERT_ENABLE
 
-// #define Z_STEP_PIN               PB_5
-// #define Z_DIR_PIN                PA_8
+//#define Z_STEP_PIN               PB_5
+//#define Z_DIR_PIN                PA_8
 //#define Z_MIN_PIN                PA_7
 //#define Z_MAX_PIN                DIO31
 //#define Z_ENABLE_PIN             PA_9

testcases/check_configtool.sh

@@ -27,12 +27,12 @@ git ls-files "config/*.h" | while read IN; do
   perl -p0 -e 's#/\*.*?\*/##sg' "${IN}" > "${OUT}.cmp"
 
   # Fail if the result is different except in whitespace.
-  if ! diff -qBbw "${OUT}" "${OUT}.cmp" ; then
+  if ! diff -qBb "${OUT}" "${OUT}.cmp" ; then
     echo "Configtool integrity test failed on file ${IN}"
     echo "  Executed: ./configtool.py --load=\"${IN}\" --save=\"${OUT}\" --quit"
     echo "  Expected resulting settings to match, but they do not."
 
-    diff -uBbw "${OUT}" "${OUT}.cmp" | sed -e 's/^/    /' || :
+    diff -uBb "${OUT}" "${OUT}.cmp" | sed -e 's/^/    /' || :
     exit 1
   fi
 done