Add a qmark-noglob feature flag

This adds a feature flag for controlling whether question marks are globs.
It is not yet hooked up.

src/future_feature_flags.cpp

@@ -12,6 +12,7 @@ features_t &mutable_fish_features() { return global_features; }
 
 const features_t::metadata_t features_t::metadata[features_t::flag_count] = {
     {stderr_nocaret, L"stderr-nocaret", L"3.0", L"^ no longer redirects stderr"},
+    {qmark_noglob, L"qmark-noglob", L"3.0", L"? no longer globs"},
 };
 
 const struct features_t::metadata_t *features_t::metadata_for(const wchar_t *name) {

src/future_feature_flags.h

@@ -10,18 +10,21 @@
 class features_t {
 public:
     /// The list of flags.
-    enum flag_t {
-        /// Whether ^ is supported for stderr redirection.
-        stderr_nocaret,
+ enum flag_t {
+     /// Whether ^ is supported for stderr redirection.
+     stderr_nocaret,
 
-        /// The number of flags.
-        flag_count
-    };
+     /// Whether ? is supported as a glob.
+     qmark_noglob,
 
-    /// Return whether a flag is set.
-    bool test(flag_t f) const {
-        assert(f >= 0 && f < flag_count && "Invalid flag");
-        return values[f];
+     /// The number of flags.
+     flag_count
+ };
+
+ /// Return whether a flag is set.
+ bool test(flag_t f) const {
+     assert(f >= 0 && f < flag_count && "Invalid flag");
+     return values[f];
     }
 
     /// Set a flag.

tests/status.out

@@ -5,5 +5,6 @@ test_function
 ####################
 # Future Feature Flags
 stderr-nocaret	off	3.0	^ no longer redirects stderr
+qmark-noglob	off	3.0	? no longer globs
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