Fix building from MSYS shell

In debugger.pro, take path that checks and sets
QMAKE_CHK_EXISTS_GLUE if QMAKE_SH isn't empty.

Change-Id: I7c37acc5867c1ac3ab6da33db3eb2479c1d4213c
Reviewed-by: Alexey Pavlov <alexey.pawlow@gmail.com>
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/debugger/debugger.pro

@@ -157,7 +157,7 @@ equals(TEST, 1):!isEmpty(copydata) {
     else: OUTPUT_DIR = $$IDE_BUILD_TREE/$$TEST_DIR
     testfile.target = $$OUTPUT_DIR/$$basename(INPUT_FILE)
     testfile.depends = $$INPUT_FILE
-    win32 {
+    win32:isEmpty(QMAKE_SH) {
         INPUT_FILE ~= s,/,\\\\,g
         OUTPUT_DIR ~= s,/,\\\\,g
     } else {