Fix exit on passing the wrong argument

Also the error message is now valid for passing the wrong argument and
also for not passing an argument.

Signed-off-by: somebody_master <somebody_master@somebodyserver.mooo.com>

build/build.sh

@@ -7,7 +7,7 @@ _build_folder="gdextension"
 
 # Error variables
 _error_build_folder="${_build_folder} doesn't exist"
-_error_no_option="\nYou have to indicate an option"
+_error_no_option="\nYou have to indicate a valid option"
 
 # Platform variables
 _platform_linux="platform=linux"
@@ -126,7 +126,7 @@ while getopts "bdchawlA" flag; do
             ;;
         \?) # Erroneus call
             Help
-            dirty_exit 0
+            clean_exit 1 "$_error_no_option"
             ;;
     esac
 done