Don't remove ~ files on make clean (and find -type was wrong anyway)

--HG--
branch : libtommath
extra : convert_revision : 38ad9968c111d9364b88e0098afc3e8e794e67e3

Makefile.in

@@ -152,7 +152,7 @@ pretty:
 clean:
 	rm -f *.bat *.pdf *.o *.a *.obj *.lib *.exe *.dll etclib/*.o demo/demo.o test ltmtest mpitest mtest/mtest mtest/mtest.exe \
-        *.idx *.toc *.log *.aux *.dvi *.lof *.ind *.ilg *.ps *.log *.s mpi.c *.da *.dyn *.dpi tommath.tex `find -type f | grep [~] | xargs` *.lo *.la
+        *.idx *.toc *.log *.aux *.dvi *.lof *.ind *.ilg *.ps *.log *.s mpi.c *.da *.dyn *.dpi tommath.tex *.lo *.la
 	rm -rf .libs
 	cd etc && make clean
 	cd pics && make clean