autoconf-2.69 need a patch (or sed) for perl-5.28

[Xi Ruoyao]

The testsuite of autoconf failed:

503. autoscan.at:44: autoscan
--- /dev/null   2018-11-13 09:38:15.278559305 +0000
+++ /sources/autoconf-2.69/tests/testsuite.dir/at-groups/503/stderr   2018-11-14 11:12:11.212817554 +0000
@@ -0,0 +1 @@
+ Unescaped left brace in regex is deprecated here (and will be fatal in Perl 5.30), passed through in regex; marked by <-- HERE in m/\${ <--HERE [^\}]*}/ at /sources/autoconf-2.69/bin/autoscan line 361.
503. autoscan.at:20: 503. autoscan (autoscan.at:20): FAILED (autoscan.at:44)

[Xi Ruoyao]

See ​http://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=e5654a5591884b92633c7785f325626711e7f7aa.

sed '361 s/{/\\{/' -i bin/autoscan.in seems good.

[Douglas R. Reno]

Fixed at r11487