factor out testcase_targets.prf

instead of letting *every* qmake-based project have recursive check target,
let interested projects "subscribe" to it by adding CONFIG+=testcase_targets
in a central place (.qmake.conf, which Qt itself does via qt_build_config.prf).

Change-Id: Ib13fdd2d3a1adee0c5ad02b6b176a664c583bf9d
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

mkspecs/features/default_post.prf

@@ -47,12 +47,3 @@ breakpad {
 
 QMAKE_INCDIR += $$QMAKE_INCDIR_POST
 QMAKE_LIBDIR += $$QMAKE_LIBDIR_POST
-
-# Let every project have a standard GNU `check' target
-!contains(QMAKE_EXTRA_TARGETS, check) {
-    contains(TEMPLATE, subdirs): \
-        prepareRecursiveTarget(check)
-    else: \
-        check.depends = first # `make check' implies build
-    QMAKE_EXTRA_TARGETS += check
-}

mkspecs/features/qt_build_config.prf

@@ -27,6 +27,7 @@ mac {
 
 CONFIG += \
     create_prl link_prl \
+    testcase_targets \
     prepare_docs qt_docs_targets \
     qt_example_installs \
     no_private_qt_headers_warning QTDIR_build \

mkspecs/features/testcase_targets.prf

@@ -0,0 +1,9 @@
+
+# Let every project have a standard GNU `check' target
+!contains(QMAKE_EXTRA_TARGETS, check) {
+    contains(TEMPLATE, subdirs): \
+        prepareRecursiveTarget(check)
+    else: \
+        check.depends = first # `make check' implies build
+    QMAKE_EXTRA_TARGETS += check
+}