Fix qbs build

Change-Id: I73bed3284d491338359c730375c2b81d947dd5a4
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>

src/libs/3rdparty/botan/botan.pri

@@ -6,7 +6,7 @@ CONFIG += exceptions
 
 DEPENDPATH += .
 
-DEFINES += BOTAN_DLL="\"\""
+DEFINES += BOTAN_DLL=
 unix:DEFINES += BOTAN_TARGET_OS_HAS_GETTIMEOFDAY BOTAN_HAS_ALLOC_MMAP \
     BOTAN_HAS_ENTROPY_SRC_DEV_RANDOM BOTAN_HAS_ENTROPY_SRC_EGD BOTAN_HAS_ENTROPY_SRC_FTW \
     BOTAN_HAS_ENTROPY_SRC_UNIX BOTAN_HAS_MUTEX_PTHREAD BOTAN_HAS_PIPE_UNIXFD_IO

src/libs/ssh/ssh.qbs

@@ -51,7 +51,7 @@ QtcLibrary {
     property var botanIncludes: ["../3rdparty"]
     property var botanLibs: qbs.targetOS === "windows" ? ["advapi32", "user32"] : ["rt", "dl"]
     property var botanDefines: {
-            var result = ['BOTAN_DLL=""']
+            var result = ['BOTAN_DLL=']
             if (qbs.toolchain === "msvc")
                 result.push("BOTAN_BUILD_COMPILER_IS_MSVC", "BOTAN_TARGET_OS_HAS_GMTIME_S")
             if (qbs.toolchain === "gcc" || qbs.toolchain === "mingw")