Add nextstep to similar template file

src/template/.similar

 alpha-dec-osf=alpha
 alpha-unknown-linux-gnu=linux_alpha
-hppa1.1-stratus-sysv4=svr4
 hppa1.1-hp-hpux10.20=hpux_cc
+hppa1.1-stratus-sysv4=svr4
+i386-next-nextstep3=nextstep
 i386-pc-bsdi2.0=bsdi_2.0
 i386-pc-bsdi2.1=bsdi_2.1
 i386-pc-bsdi3.0=bsdi_3.0
@@ -20,6 +21,6 @@ powerpc-ibm-aix4.1.4.0=aix_41
 powerpc-ibm-aix4.1.5.0=aix_41
 powerpc-unknown-linux-gnu=linux_ppc
 sparc-sun-solaris=solaris_sparc_gcc
+sparc-sun-sunos4=sunos4_gcc
 sparc-sun-sunos5=solaris_sparc_gcc
 sparc-unknown-linux-gnu=linux_sparc
-sparc-sun-sunos4=sunos4_gcc