SCons: Fix feature build profile being parsed too late

Also renames the option to just `build_profile`, the previous one was
too verbose and had words in the wrong order.

Fixes #70643.

SConstruct

@@ -202,7 +202,7 @@ opts.Add("extra_suffix", "Custom extra suffix added to the base filename of all
 opts.Add(BoolVariable("vsproj", "Generate a Visual Studio solution", False))
 opts.Add(BoolVariable("disable_3d", "Disable 3D nodes for a smaller executable", False))
 opts.Add(BoolVariable("disable_advanced_gui", "Disable advanced GUI nodes and behaviors", False))
-opts.Add("build_feature_profile", "Path to a file containing a feature build profile", "")
+opts.Add("build_profile", "Path to a file containing a feature build profile", "")
 opts.Add(BoolVariable("modules_enabled_by_default", "If no, disable all modules except ones explicitly enabled", True))
 opts.Add(BoolVariable("no_editor_splash", "Don't use the custom splash screen for the editor", True))
 opts.Add("system_certs_path", "Use this path as SSL certificates default for editor (for package maintainers)", "")
@@ -492,6 +492,25 @@ if selected_platform in platform_list:
     env["LINKFLAGS"] = ""
     env.Append(LINKFLAGS=str(LINKFLAGS).split())
 
+    # Feature build profile
+    disabled_classes = []
+    if env["build_profile"] != "":
+        print("Using feature build profile: " + env["build_profile"])
+        import json
+
+        try:
+            ft = json.load(open(env["build_profile"]))
+            if "disabled_classes" in ft:
+                disabled_classes = ft["disabled_classes"]
+            if "disabled_build_options" in ft:
+                dbo = ft["disabled_build_options"]
+                for c in dbo:
+                    env[c] = dbo[c]
+        except:
+            print("Error opening feature build profile: " + env["build_profile"])
+            Exit(255)
+    methods.write_disabled_classes(disabled_classes)
+
     # Platform specific flags.
     # These can sometimes override default options.
     flag_list = platform_flags[selected_platform]
@@ -818,26 +837,6 @@ if selected_platform in platform_list:
     env["LIBSUFFIX"] = suffix + env["LIBSUFFIX"]
     env["SHLIBSUFFIX"] = suffix + env["SHLIBSUFFIX"]
 
-    disabled_classes = []
-
-    if env["build_feature_profile"] != "":
-        print("Using build feature profile: " + env["build_feature_profile"])
-        import json
-
-        try:
-            ft = json.load(open(env["build_feature_profile"]))
-            if "disabled_classes" in ft:
-                disabled_classes = ft["disabled_classes"]
-            if "disabled_build_options" in ft:
-                dbo = ft["disabled_build_options"]
-                for c in dbo:
-                    env[c] = dbo[c]
-        except:
-            print("Error opening feature build profile: " + env["build_feature_profile"])
-            Exit(255)
-
-    methods.write_disabled_classes(disabled_classes)
-
     if env["disable_3d"]:
         if env.editor_build:
             print("Build option 'disable_3d=yes' cannot be used for editor builds, but only for export templates.")