Change sort order for source files (sort by compile time)

This should give slightly faster build times when
compiling in parallel with many threads.

bigger files (in terms of compile time) tend to go to the top,
so they don't end up as the last compile unit when compiling
in parallel. But we also want to mix them a little too avoid
heavy RAM usage peaks. Other than that the order is arbitrary.

Author: mgreter

Makefile.conf

@@ -1,46 +1,51 @@
 # this is merely a common Makefile multiple implementers can use
+# bigger files (in terms of compile time) tend to go to the top,
+# so they don't end up as the last compile unit when compiling
+# in parallel. But we also want to mix them a little too avoid
+# heavy RAM usage peaks. Other than that the order is arbitrary.
+
 
 SOURCES = \
 	ast.cpp \
-	base64vlq.cpp \
-	bind.cpp \
-	check_nesting.cpp \
-	color_maps.cpp \
-	constants.cpp \
+	node.cpp \
 	context.cpp \
-	cssize.cpp \
-	emitter.cpp \
+	constants.cpp \
+	functions.cpp \
+	color_maps.cpp \
 	environment.cpp \
-	error_handling.cpp \
-	eval.cpp \
-	expand.cpp \
-	extend.cpp \
+	bind.cpp \
 	file.cpp \
-	functions.cpp \
-	inspect.cpp \
+	util.cpp \
 	json.cpp \
-	lexer.cpp \
-	listize.cpp \
-	memory_manager.cpp \
-	node.cpp \
-	output.cpp \
-	parser.cpp \
+	units.cpp \
+	values.cpp \
 	plugins.cpp \
 	position.cpp \
+	lexer.cpp \
+	parser.cpp \
 	prelexer.cpp \
+	eval.cpp \
+	expand.cpp \
+	listize.cpp \
+	cssize.cpp \
+	extend.cpp \
+	output.cpp \
+	inspect.cpp \
+	emitter.cpp \
+	check_nesting.cpp \
 	remove_placeholders.cpp \
 	sass.cpp \
 	sass_util.cpp \
 	sass_values.cpp \
 	sass_context.cpp \
 	sass_functions.cpp \
 	sass2scss.cpp \
-	source_map.cpp \
 	to_c.cpp \
 	to_value.cpp \
-	units.cpp \
+	source_map.cpp \
+	error_handling.cpp \
+	memory_manager.cpp \
 	utf8_string.cpp \
-	values.cpp \
-	util.cpp
+	base64vlq.cpp
 
 CSOURCES = cencode.c