Fix `make check' for debug-and-release on Windows.

(cherry picked from commit 012a777)

Author: Rohan McGovern

mkspecs/features/testcase.prf

@@ -6,8 +6,22 @@ check.path                 = .
 # If the test ends up in a different directory, we should cd to that directory.
 # Note that qmake modifies DESTDIR after this file is processed,
 # therefore, testing DESTDIR for emptiness is not sufficient.
-!isEmpty(DESTDIR):!contains(DESTDIR,^\./?): check.commands = cd $(DESTDIR) &&
-contains(TARGET,.*/.*):   check.commands = cd $(DESTDIR) &&
+# Also note that in debug-and-release mode we don't want to cd into the debug/release
+# directory (e.g. if the test goes to foo/release/tst_thing.exe, we want to do
+#  cd foo && release/tst_thing.exe ).
+MUNGED_DESTDIR=$$DESTDIR
+MUNGED_TARGET=$$TARGET
+win32:debug_and_release {
+    contains(DESTDIR,^release$)|contains(DESTDIR,^debug$):MUNGED_DESTDIR=
+
+    # In debug-and-release mode, the first ../ in TARGET breaks out of the debug/release
+    # subdirectory. However, since make's working directory is already outside of the
+    # debug/release subdirectory, this first ../ should be ignored when deciding if
+    # we have to change directory before running the test.
+    MUNGED_TARGET=$$replace(MUNGED_TARGET,^\.\./,)
+}
+!isEmpty(MUNGED_DESTDIR):!contains(MUNGED_DESTDIR,^\./?):check.commands = cd $(DESTDIR) &&
+contains(MUNGED_TARGET,.*/.*):check.commands = cd $(DESTDIR) &&
 
 # Allow for a custom test runner script
 check.commands += $(TESTRUNNER)