Relocate Date provider snippet in genconfig output

The new Date provider snippet location is after duk_custom.h and other
overrides, so that e.g. user custom header can define
DUK_USE_DATE_NOW_GETTIMEOFDAY even if the platform detection does not.

config/genconfig.py

@@ -953,8 +953,6 @@ def generate_autodetect_duk_config_header(opts, meta_dir):
 
 	ret.file_relative('unsorted_flags.h.in')
 	ret.empty()
-	ret.file_relative('date_provider.h.in')
-	ret.empty()
 
 	ret.file_relative('user_declare.h.in')
 	ret.empty()
@@ -1042,6 +1040,12 @@ def generate_autodetect_duk_config_header(opts, meta_dir):
 
 	add_override_defines_section(opts, ret)
 
+	# Date provider snippet is after custom header and overrides, so that
+	# the user may define e.g. DUK_USE_DATE_NOW_GETTIMEOFDAY in their
+	# custom header.
+	ret.file_relative('date_provider.h.in')
+	ret.empty()
+
 	# FIXME: use autogenerated sanity instead of sanity.h.in
 
 	ret.file_relative('sanity.h.in')
@@ -1216,10 +1220,6 @@ def generate_barebones_duk_config_header(opts, meta_dir):
 	ret.line(' */')
 	ret.empty()
 
-	# FIXME: this should probably happen inside Duktape? It's very much
-	# boilerplate here.
-	ret.snippet_relative('date_provider.h.in')
-
 	if len(opts.fixup_header_lines) > 0:
 		ret.empty()
 		ret.line('/*')
@@ -1231,6 +1231,13 @@ def generate_barebones_duk_config_header(opts, meta_dir):
 
 	add_override_defines_section(opts, ret)
 
+	# Date provider snippet is after custom header and overrides, so that
+	# the user may define e.g. DUK_USE_DATE_NOW_GETTIMEOFDAY in their
+	# custom header.
+	ret.empty()
+	ret.snippet_relative('date_provider.h.in')
+	ret.empty()
+
 	ret.upgrade_to_snippets()
 	ret.fill_dependencies_for_snippets(idx_deps)