gitignore: update stubdom entries

Add stubdom/libs-* to gitignore, then sort stubdom/* entries
alphabetically.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

.gitignore

@@ -50,32 +50,33 @@ extras/mini-os*
 install/*
 stubdom/autom4te.cache/
 stubdom/binutils-*
+stubdom/config.cache
 stubdom/config.log
 stubdom/config.status
-stubdom/config.cache
 stubdom/cross-root-*
 stubdom/gcc-*
+stubdom/gmp-*
+stubdom/grub-*
 stubdom/include
 stubdom/ioemu
-stubdom/xenstore
-stubdom/libxentoollog-*
+stubdom/ioemu/
+stubdom/libs-*
 stubdom/libxc-*
+stubdom/libxentoollog-*
 stubdom/lwip-*
+stubdom/lwip/
 stubdom/mini-os-*
 stubdom/mk-headers-*
 stubdom/newlib-1.*
 stubdom/newlib-x86*
-stubdom/pciutils-*
-stubdom/zlib-*
-stubdom/grub-*
 stubdom/ocaml-*
+stubdom/pciutils-*
 stubdom/polarssl-*
-stubdom/gmp-*
-stubdom/tpm_emulator-*
-stubdom/lwip/
-stubdom/ioemu/
 stubdom/stubdompath.sh
+stubdom/tpm_emulator-*
 stubdom/vtpm/vtpm_manager.h
+stubdom/xenstore
+stubdom/zlib-*
 tools/*/build/lib*/*.py
 tools/autom4te.cache/
 tools/config.h