fix build on Solaris; had to add %{l_nil} macro to make 'opd lint' happy

mutt/mutt.spec

@@ -38,7 +38,7 @@ Class:        BASE
 Group:        Mail
 License:      BSD
 Version:      %{V_mutt}
-Release:      20060831
+Release:      20061011
 
 #   build options
 %option       with_comp      no
@@ -171,6 +171,7 @@ AutoReqProv:  no
     CPPFLAGS="%{l_cppflags libidn .}" \
 %endif
     LDFLAGS="-Limap %{l_ldflags}" \
+    INSTALL="%{l_shtool} install%{l_nil} -c" \
     ./configure \
         --prefix=%{l_prefix} \
         --sysconfdir=%{l_prefix}/etc/mutt \