Fix dartanalyzer.bat so it works when there are spaces in the path to dart sdk.

sdk/bin/dartanalyzer.bat

Index: sdk/bin/dartanalyzer.bat
diff --git a/sdk/bin/dartanalyzer.bat b/sdk/bin/dartanalyzer.bat
index d3ed53b2a35621f16d2c15cc1ecb8bc569b74bbf..490512446376baf4782c3a1b40c4cbb8fee2095b 100644
--- a/sdk/bin/dartanalyzer.bat
+++ b/sdk/bin/dartanalyzer.bat
@@ -36,12 +36,12 @@ if [%FOUND_SDK%] == [0] (
     )
   )
 )
-endlocal & set "DART_SDK=%DART_SDK%" & set "DART_SDK_HOME=%DART_SDK_HOME%"
+endlocal & set DART_SDK=%DART_SDK% & set DART_SDK_HOME=%DART_SDK_HOME%
 
 if exist "%DART_SDK_HOME%\util\dartanalyzer\dartanalyzer.jar" (
-  set DART_ANALYZER_LIBS="%DART_SDK_HOME%\util\dartanalyzer"
+  set DART_ANALYZER_LIBS=%DART_SDK_HOME%\util\dartanalyzer
 ) else if exist "%DART_ANALYZER_HOME%\util\dartanalyzer\dartanalyzer.jar" (
-  set DART_ANALYZER_LIBS="%DART_ANALYZER_HOME%\util\dartanalyzer"
+  set DART_ANALYZER_LIBS=%DART_ANALYZER_HOME%\util\dartanalyzer
 ) else (
   echo Configuration problem. Couldn't find dartanalyzer.jar.
   exit /b 1