This was missed by commit 7bbaa428 (Remove trailing whitespace from most CMake and C/C++ code, 2012-08-13) which only removed trailing spaces, not TABs.
@@ -481,7 +481,7 @@ Loop:
StrCmp "$R2" "$\r" RTrim
StrCmp "$R2" ";" RTrim
GoTo Done
-RTrim:
+RTrim:
StrCpy $R1 "$R1" -1
Goto Loop
Done: