Use a POSIX shell in bin/tests/system/ifconfig.sh

Some non-POSIX shells, like /bin/csh on FreeBSD, are unable to execute
the config.guess file:

    + /bin/csh /var/tmp/gitlab_runner/builds/YdCaoq4b/0/mnowak/bind9/config.guess
    timestamp=2018-02-24: Command not found.
    me=config.guess: Command not found.
    Unmatched '"'.

When ./configure is run, it attempts to locate a POSIX-compliant shell.
Use the result of that search in the bin/tests/system/ifconfig.sh
script.

diff --git a/bin/tests/system/ifconfig.sh.in b/bin/tests/system/ifconfig.sh.in
index 67ed60c392988170abe33ceb388074b92bf780cb..52b4a5796d0b3b0c646bd5689687ec9c95ab6da0 100755 (executable)
--- a/bin/tests/system/ifconfig.sh.in
+++ b/bin/tests/system/ifconfig.sh.in
@@ -22,7 +22,7 @@
 
 top_srcdir=@abs_top_srcdir@
 
-sys=$($SHELL "$top_srcdir/config.guess")
+sys=$(@SHELL@ "$top_srcdir/config.guess")
 
 use_ip=
 case "$sys" in