Doc build: fix conflicting response file with moc

Doc build is using the same variable to define the reponse file
as moc build, which can lead to case where moc is using the qdoc's
response file instead of its own. Moc needs more include paths than
qdoc, this can then lead to weird compilation issues as moc doesn't
warn about missing includes.

Task-number: QTBUG-98569
Pick-to: 6.2 5.15
Change-Id: Id35da18f664e2032bae96d11b00dbfe55ce37f66
Reviewed-by: Joerg Bornemann <[email protected]>

mkspecs/features/qt_docs.prf

@@ -29,20 +29,20 @@ QT_TOOL_ENV =
 
 # On Windows, put the includes into a .inc file which QDoc will read, if the project
 # has too many includes. We do this to overcome a command-line limit on Windows.
-WIN_INCLUDETEMP=
+QDOC_WIN_INCLUDETEMP=
 INCLUDE_PATHS=$$INCPATH
 win32:count(INCLUDE_PATHS, 30, >) {
-    WIN_INCLUDETEMP = $$OUT_PWD/qdocincludepaths.inc
-    WIN_INCLUDETEMP_CONTENT =
+    QDOC_WIN_INCLUDETEMP = $$OUT_PWD/qdocincludepaths.inc
+    QDOC_WIN_INCLUDETEMP_CONTENT =
     for (inc, INCLUDE_PATHS): \
-        WIN_INCLUDETEMP_CONTENT += -I$$inc
-    write_file($$absolute_path($$WIN_INCLUDETEMP, $$OUT_PWD), WIN_INCLUDETEMP_CONTENT)|error()
+        QDOC_WIN_INCLUDETEMP_CONTENT += -I$$inc
+    write_file($$absolute_path($$QDOC_WIN_INCLUDETEMP, $$OUT_PWD), QDOC_WIN_INCLUDETEMP_CONTENT)|error()
 }
 
-isEmpty(WIN_INCLUDETEMP) {
+isEmpty(QDOC_WIN_INCLUDETEMP) {
     QDOC_INCLUDE_PATHS=$(INCPATH)
 } else {
-    QDOC_INCLUDE_PATHS=@$$shell_quote($$WIN_INCLUDETEMP)
+    QDOC_INCLUDE_PATHS=@$$shell_quote($$QDOC_WIN_INCLUDETEMP)
 }
 
 macos: QDOC_INCLUDE_PATHS += $$join(QMAKE_DEFAULT_INCDIRS," -I","-I")