add mips to supported arch list in INSTALL file
diff --git a/INSTALL b/INSTALL
index f39d627..720c94e 100644
--- a/INSTALL
+++ b/INSTALL
@@ -19,7 +19,7 @@
you don't need threads or POSIX 2008 features, even 2.4 is probably
okay.
-- A supported CPU architecture (currently i386, x86_64, or arm).
+- A supported CPU architecture (currently i386, x86_64, arm, or mips).
- If you want to use dynamic linking, it's recommended that you have
permissions to write to /lib and /etc. Otherwise your binaries will