Revert "Compile with Visual Studio IDE: string macros don't need to be escaped"

This reverts commit fe80df7e.

With the above commit, Creator could not be compiled with MSVC 2008.

Change-Id: Idf4763fa1996edf3b94b7059b1889e0b4dd74d38
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

qtcreator.pri

@@ -75,11 +75,8 @@ isEmpty(TEST):CONFIG(debug, debug|release) {
 isEmpty(IDE_LIBRARY_BASENAME) {
     IDE_LIBRARY_BASENAME = lib
 }
-win32-msvc* {
-    DEFINES += IDE_LIBRARY_BASENAME=\"$$IDE_LIBRARY_BASENAME\"
-} else {
-    DEFINES += IDE_LIBRARY_BASENAME=\\\"$$IDE_LIBRARY_BASENAME\\\"
-}
+
+DEFINES += IDE_LIBRARY_BASENAME=\\\"$$IDE_LIBRARY_BASENAME\\\"
 
 equals(TEST, 1) {
     QT +=testlib

src/libs/extensionsystem/extensionsystem.pro

@@ -6,11 +6,7 @@ include(extensionsystem_dependencies.pri)
 
 unix:!macx:!freebsd*:LIBS += -ldl
 
-win32-msvc* {
-    DEFINES += IDE_TEST_DIR=\"$$IDE_SOURCE_TREE\"
-} else {
-    DEFINES += IDE_TEST_DIR=\\\"$$IDE_SOURCE_TREE\\\"
-}
+DEFINES += IDE_TEST_DIR=\\\"$$IDE_SOURCE_TREE\\\"
 
 HEADERS += pluginerrorview.h \
     plugindetailsview.h \