Fix wrapper batch file names for flex/bison in ANGLE build

The wrapper batch files were called wrapper.bat for both, flex and
bison. Resolve this conflict by providing proper tool names.

Change-Id: I7987f94976abc29302c9f6a696faa5c7d1fb030d
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

src/angle/src/config.pri

@@ -23,6 +23,7 @@ equals(QMAKE_HOST.os, Windows) {
 defineReplace(addGnuPath) {
     gnuPath = $$1
     !isEmpty(gnuPath):!isEmpty(gnutools.name) {
+        QT_TOOL_NAME = $$1
         qtAddToolEnv(gnuPath, gnutools)
         silent: gnuPath = @echo generating sources from ${QMAKE_FILE_IN} && $$gnuPath
     }