m4/mknod.m4: minor portability fix

[Christian Weisgerber]

I noticed this in GNU tar 1.25 when FreeBSD's test(1) complained:

Use "=" operator for test(1), rather than non-standard "==".


--- m4/mknod.m4.orig    Tue Nov  9 17:35:22 2010
+++ m4/mknod.m4 Tue Nov  9 17:35:32 2010
@@ -30,7 +30,7 @@
       if (!geteuid ()) return 99;
       if (mknod ("conftest.fifo", S_IFIFO | 0600, 0)) return 2;]])],
          [gl_cv_func_mknod_works=yes],
-         [if test $? == 99 && test x"$FORCE_UNSAFE_CONFIGURE" = x; then
+         [if test $? = 99 && test x"$FORCE_UNSAFE_CONFIGURE" = x; then
             AC_MSG_FAILURE([you should not run configure as root ]dnl
 [(set FORCE_UNSAFE_CONFIGURE=1 in environment to bypass this check)])
           fi
-- 
Christian "naddy" Weisgerber                          address@hidden