Fix unportable sed script in maintainer-check test.

[Ralf Wildenhues]

For maint.

Cheers,
Ralf

    Fix unportable sed script in maintainer-check test.
    
    * Makefile.am (sc_tests_Exit_not_exit): Rewrite sed script to
    not contain semicolon after 'b' or brace commands, for NetBSD.

diff --git a/Makefile.am b/Makefile.am
index c487874..bbcc882 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -323,7 +323,8 @@ sc_tests_here_document_format:
 ## Ignore comments, and ignore one perl line in ext2.test.
 sc_tests_Exit_not_exit:
        @found=false; for file in $(srcdir)/tests/*.test; do \
-         res=`sed -n '/^#/d; /^\$$PERL/d; /<<.*END/,/^END/{b;}; 
/<<.*EOF/,/^EOF/{b;}; /exit [$$0-9]/p' $$file`; \
+         res=`sed -n -e '/^#/d; /^\$$PERL/d' -e '/<<.*END/,/^END/b' \
+                     -e '/<<.*EOF/,/^EOF/b' -e '/exit [$$0-9]/p' $$file`; \
          if test -n "$$res"; then \
            echo "$$file:$$res"; \
            found=true; \