Fix typo discovered by codespell

cclauss · web-flow · commit 963e268b43dc · 2021-07-15T01:19:52.000+02:00
diff --git a/build_sfx.bat b/build_sfx.bat
@@ -21,7 +21,7 @@ CALL build.bat
 GOTO END
 
 :ERROR
-ECHO An error occured. Build interrupted.
+ECHO An error occurred. Build interrupted.
 
 :END
 
