Clean up .gitignore

.gitignore

@@ -1,20 +1,18 @@
+*.[ao]
+*.l[ao]
 .deps/
 .libs/
-INSTALL
-Makefile
-Makefile.in
-aclocal.m4
-autom4te.cache/
-autostuff/
-config.h.in
-config.h
-config.log
-config.status
-configure
-libserialport.la
-libserialport.pc
-libserialport.h
-libtool
-stamp-h1
-*.o
-*.lo
+/INSTALL
+/Makefile
+/Makefile.in
+/aclocal.m4
+/autom4te.cache/
+/autostuff/
+/config.*
+/configure
+/configure.lineno
+/libserialport-*.tar.*
+/libserialport.h
+/libserialport.pc
+/libtool
+stamp-h?