Update installation instructions

Remove the -f (force) flag from autoreconf. When it is present, it over
writes the INSTALL file with the generic template losing the audit project's
instructions.

Author: stevegrubb

INSTALL

@@ -4,7 +4,7 @@ Then do this:
 
 git clone https://github.com/linux-audit/audit-userspace.git
 cd audit-userspace
-autoreconf -fv --install
+autoreconf -v --install
 ./configure
 make dist