PKG: fix cmake invalid escape sequence and newline

CMake/PackageHelper.cmake

@@ -101,17 +101,11 @@ function(install_common outdir)
   endforeach()
 
   install(CODE "file(WRITE \"${CMAKE_INSTALL_PREFIX}/${PKG_PREFIX_DIR}/otbenv.cmd\"
-    \"set CURRENT_SCRIPT_DIR=%~dp0
-    set PATH=%PATH%;%CURRENT_SCRIPT_DIR%\\bin
-    set GDAL_DATA=%CURRENT_SCRIPT_DIR%\\share\\gdal
-    \")" )
+               \"set CURRENT_SCRIPT_DIR=%~dp0\nset PATH=%PATH%;%CURRENT_SCRIPT_DIR%\\\\bin\nset GDAL_DATA=%CURRENT_SCRIPT_DIR%\\\\share\\\\gdal\n\")" )
 
   ####################### create and install qt.conf #######################
   install(CODE "file(WRITE \"${PKG_QTCONF_DIR}/qt.conf\"
-                \"[Paths]
-                Translations=../lib/qt4/translations
-                Plugins=../lib/qt4/plugins
-                \")" )
+                \"[Paths]\nTranslations=../lib/qt4/translations\nPlugins=../lib/qt4/plugins\n\")" )
 
   ####################### install sqldriver plugin ########################
   install(FILES ${QT_PLUGINS_DIR}/sqldrivers/${PKG_QTSQLITE_FILENAME}