build-sys: remove "make mrproper", git-clean is good enough

Signed-off-by: Karel Zak <kzak@redhat.com>

Makefile.am

@@ -32,15 +32,6 @@ distclean-local:
 	-find . -name \*~ -o -name \*.orig -o -name \*.rej | xargs rm -f
 	rm -rf autom4te.cache
 
-mrproper: distclean
-	if [ -f ".gitignore" ]; then \
-		find -name Makefile.in | xargs rm -f ; \
-		rm -f configure ABOUT-NLS ; \
-		rm -rf m4 ; \
-		cd config; rm -f `cat ../.gitignore`; cd .. ; \
-		cd po; rm -f `cat .gitignore`; cd .. ; \
-	fi
-
 ENABLE_ALL = --enable-elvtune --enable-init --enable-kill --enable-last \
  --enable-mesg --enable-partx --enable-raw --enable-rdev --enable-reset \
  --enable-login-utils --enable-write

README.devel

@@ -7,11 +7,8 @@ AUTOTOOLS:
      * "./autogen.sh" generates all necessary files (run it after checkout from
        git)
 
-     * "make mrproper" removes all generates files. You have to call autogen.sh
-       after mrproper.
-
-     * "make distclean" is subset of mrproper. It removes all unnecessary files,
-       but code is still possible recompile by "./configure; make"
+     * "make distclean" removes all unnecessary files, but code is still possible 
+       recompile by "./configure; make"
 
      * "make dist-gzip" (or -bzip2) creates tarball which is possible use without
       autogen.sh
@@ -24,7 +21,7 @@ PATCHES:
 
      * diff -u
 
-     * don't include generated (autotools) stuff to your patches
+     * don't include generated (autotools) stuff to your patches (use git-clean [-X])
 
      * patches are delivered via email only.  Downloading them from internet
        servers is a pain.