testsuite: .gitignore symlink

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

test/.gitignore

@@ -268,6 +268,7 @@ unistd/errno
 unistd/exec-null
 unistd/fork
 unistd/getconf
+unistd/getconf.c
 unistd/getcwd
 unistd/getopt
 unistd/getopt_long