Remove tabs in shell script

Indentation by tab will cause a file listing for the current directory
before the command is executed, and that what not intended here.

configure

@@ -72,9 +72,9 @@ while getopts -- ":-:" optchar; do
           prefix=${OPTARG#*=}
           ;;
         help)
-		  usage
-		  exit 0
-		  ;;
+          usage
+          exit 0
+          ;;
         with-*)
           # get the name of the package; everything before equal sign
           pkgname=${OPTARG%=*}
@@ -139,15 +139,15 @@ while getopts -- ":-:" optchar; do
           ;;
         *)
           # remove everything *after* the equal sign
-		  arg=${OPTARG%=*}
+          arg=${OPTARG%=*}
           invalid_arg --$arg
-		  exit 1
-	      ;;
+          exit 1
+          ;;
       esac
-	  ;;
+      ;;
     *)
-	  invalid_arg -$OPTARG
-	  exit 1
+      invalid_arg -$OPTARG
+      exit 1
       ;;
   esac
 done