don't emit comments to generated qfeatures.h

the file is not meant to be human-readable and even less editable, so
there is no point in having comments in it.

also, it was completely inconsistent to start with: features without
dependencies were listed as "templates" in form of commented out
 #defines to disable them manually, while features with dependencies
had a respective #ifdef block to be automatically disabled, but no
"template" to disable them manually. now only the #ifdef blocks remain.
the actual configuration is done by configure via qconfig.h.

Change-Id: I8b9e56ba570908dad4cc6dfcd24bf0e1da8b290f
Reviewed-by: Tasuku Suzuki <stasuku@gmail.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

qtbase.pro

@@ -127,17 +127,12 @@ features = $$sort_depends(features, features.)
 features = $$reverse(features)
 FEATURES_H = \
     "/*" \
-    " * All features and their dependencies." \
+    " * All feature dependencies." \
     " *" \
     " * This list is generated by qmake from <qtbase>/src/corelib/global/qfeatures.txt" \
     " */"
 for (ft, features) {
-    FEATURES_H += \
-        "$$escape_expand(\\n)// $$eval(features.$${ft}.name)"
-    isEmpty(features.$${ft}.depends) {
-        FEATURES_H += \
-            "//$${LITERAL_HASH}define QT_NO_$$ft"
-    } else {
+    !isEmpty(features.$${ft}.depends) {
         FEATURES_H += \
             "$${LITERAL_HASH}if !defined(QT_NO_$$ft) && ($$join($$list($$split(features.$${ft}.depends)), ") || defined(QT_NO_", "defined(QT_NO_", ")"))" \
             "$${LITERAL_HASH}  define QT_NO_$$ft" \