Fix deployment target on macOS

According to the README, the minimum version is 10.8, but the code did
not reflect that reality.

Change-Id: I2bbaeefe614cba5b5fa8413b68202bb75f346d70
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

qbs/imports/QtcAutotest.qbs

@@ -15,7 +15,6 @@ QtcProduct {
         project.buildDirectory + '/' + qtc.ide_library_path,
         project.buildDirectory + '/' + qtc.ide_plugin_path
     ]
-    cpp.minimumOsxVersion: "10.7"
     cpp.defines: base.filter(function(d) { return d != "QT_RESTRICTED_CAST_FROM_ASCII"; })
 
     Group {

qbs/imports/QtcProduct.qbs

 import qbs 1.0
 import qbs.FileInfo
+import qbs.Utilities
 import QtcFunctions
 
 Product {
@@ -19,9 +20,13 @@ Product {
     Depends { name: "qtc" }
     Depends { name: product.name + " dev headers"; required: false }
 
+    Properties {
+        condition: Utilities.versionCompare(Qt.core.version, "5.7") < 0
+        cpp.minimumMacosVersion: "10.8"
+    }
+
     cpp.cxxLanguageVersion: "c++14"
     cpp.defines: qtc.generalDefines
-    cpp.minimumOsxVersion: "10.7"
     cpp.minimumWindowsVersion: qbs.architecture === "x86" ? "5.1" : "5.2"
     cpp.useCxxPrecompiledHeader: useNonGuiPchFile || useGuiPchFile
     cpp.visibility: "minimal"

qtcreator.pri

@@ -59,7 +59,7 @@ defineReplace(stripSrcDir) {
     return($$relative_path($$absolute_path($$1, $$OUT_PWD), $$_PRO_FILE_PWD_))
 }
 
-macos:!minQtVersion(5, 7, 0) {
+darwin:!minQtVersion(5, 7, 0) {
     # Qt 5.6 still sets deployment target 10.7, which does not work
     # with all C++11/14 features (e.g. std::future)
     QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.8

src/app/Info.plist

@@ -253,6 +253,6 @@
 	<key>CFBundleShortVersionString</key>
 	<string>@SHORT_VERSION@</string>
 	<key>LSMinimumSystemVersion</key>
-	<string>10.7.0</string>
+	<string>10.8</string>
 </dict>
 </plist>

src/app/app.pro

@@ -38,7 +38,7 @@ win32 {
                 --app-icon qtcreator \
                 --output-partial-info-plist $$shell_quote($(TMPDIR)/qtcreator.Info.plist) \
                 --platform macosx \
-                --minimum-deployment-target 10.7 \
+                --minimum-deployment-target $$QMAKE_MACOSX_DEPLOYMENT_TARGET \
                 --compile $$shell_quote($$IDE_DATA_PATH) \
                 $$shell_quote($$PWD/qtcreator.xcassets) > /dev/null
             ASSETCATALOG.input = ASSETCATALOG.files