BaseTools: Update BrotliCompress script to handle the different input format

After this update, BrotliCompress can support below styles.
BrotliCompress -e InputFile -o OutputFile
BrotliCompress -e -o OutputFile InputFile

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>

BaseTools/BinWrappers/PosixLike/BrotliCompress

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# This script will exec Brotli tool.
+# This script will exec Brotli tool with -e/-d options.
 #
 # Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
 # This program and the accompanying materials
@@ -13,50 +13,37 @@
 #
 QLT="-q 9"
 INPUTFLAG=0
+ARGS=
 
-for arg; do
-  if [ $1 = -d ]
-    then
+while test $# -gt 0
+do
+  case $1 in
+    -e)
       INPUTFLAG=1
-  fi
-  if [ $1 = -e ]
-    then
+      ;;
+    -d)
       INPUTFLAG=1
-      shift
-      continue;
-  fi
-  if [ $1 = -g ]
-    then
+      ARGS+="$1 "
+      ;;
+    -o|-g)
       ARGS+="$1 $2 "
       shift
-      shift
-      continue;
-  fi
-  if [ $1 = -o ]
-    then
-      ARGS+="$1 $2 "
-      shift
-      shift
-      continue;
-  fi
-  if [ $1 = -q ]
-    then
+      ;;
+    -q)
       QLT="$1 $2 "
       shift
-      shift
-      continue;
-  fi
-  if [ $INPUTFLAG -eq 1 ]
-    then
-      if [ -z $2 ]
+      ;;
+    *)
+      if [ $INPUTFLAG -eq 1 ]
         then
-          ARGS+="$QLT -i $1 "
-          break;
+          ARGS+="-i $1 "
+          INPUTFLAG=0
+        else
+          ARGS+="$1 "
       fi
-  fi
-
-ARGS+="$1 "
-shift
+      ;;
+  esac
+  shift
 done
 
-exec Brotli $ARGS
+exec Brotli $ARGS $QLT