iOS: Build simulator libraries with suffix

Makes it possible to join two separate builds, and opens up for using
exclusive builds to do this.

Change-Id: I87ccbdd55511fdfbef3fe8b581f40525ebf077ed
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>

mkspecs/features/qt_functions.prf

@@ -1,11 +1,16 @@
 defineReplace(qtPlatformTargetSuffix) {
+    ios:CONFIG(iphonesimulator, iphonesimulator|iphoneos): \
+        suffix = _iphonesimulator
+    else: \
+        suffix =
+
     CONFIG(debug, debug|release) {
         !debug_and_release|build_pass {
-           mac:return(_debug)
-           win32:return(d)
+            mac: return($${suffix}_debug)
+            win32: return($${suffix}d)
         }
     }
-    return()
+    return($$suffix)
 }
 
 defineReplace(qtLibraryTarget) {

mkspecs/macx-ios-clang/features/default_pre.prf

@@ -1,6 +1,10 @@
 
 load(default_pre)
 
+# In case Qt was built for a specific SDK
+!iphonesimulator_and_iphoneos:contains(QMAKE_MAC_SDK, ^iphonesimulator.*): \
+    CONFIG += iphonesimulator
+
 # Check for supported Xcode versions
 lessThan(QMAKE_XCODE_VERSION, "4.3"): \
     error("This mkspec requires Xcode 4.3 or later")