Add autotools generated files to the .gitignore.

.gitignore

@@ -9,5 +9,22 @@ tests/unittests/unittests
 *.la
 *.libs
 *.deps
+*~
 .cproject
 .project
+build/
+
+# Files generated by autoconf
+Makefile.in
+aclocal.m4
+ar-lib
+autom4te.cache/
+compile
+config.guess
+config.h.in
+config.sub
+configure
+depcomp
+install-sh
+ltmain.sh
+missing