Better dependency checking.

git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@1504 8092fc87-c524-0410-9efc-e669fe64eaf9

sc2/build/unix/todo

@@ -1,19 +1,13 @@
 - flag for an option to set if changing it will trigger a new 'make depend'
 - same for 'make clean'
 - Specify files to be removed on clean.
-- PROG_*_DETECT, LIB_*_DETECT
 - static compilation
-- error message for './build.sh uqm asdasddsa'
-- option to (re)generate files from config.state
-  (useful for automatic building)
 - generating tags files
 
+
 some docs
-  - sc2_LDFLAGS etc are only relevant in the top dir
-  - some variables are 'inherited' from parent dir
-  - files are sourced (.)
-  - make clean
-  - make distclean
-    - .depend files
-  - description of files
+- uqm_LDFLAGS etc are only relevant in the top dir
+- some variables are 'inherited' from parent dir
+- files are sourced (.)
+