bug#22372: [PATCH] automake.in: fix deprecated regex syntax

[Enrico Jorns]

Running automake with perl >= 5.22.0 produces the warning

  Unescaped left brace in regex is deprecated, passed through in regex;
  marked by <-- HERE in m/\${ <-- HERE ([^ \t=:+{}]+)}/ at
  
/ptx/work/dude/ejo/temptest/nodistro.0/sysroots/x86_64-oesdk-linux/usr/bin/automake
  line 3936.

With perl-5.22.0 using a literal '{' in regexp is deprecated and should
be escaped.
This patch escapes the '{' characters to match in the regex of function
`substitute_ac_subst_variables_worker`.

Signed-off-by: Enrico Jorns <address@hidden>
---
 bin/automake.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bin/automake.in b/bin/automake.in
index c1d1a8a..2a690e6 100644
--- a/bin/automake.in
+++ b/bin/automake.in
@@ -3741,7 +3741,7 @@ sub substitute_ac_subst_variables_worker
 sub substitute_ac_subst_variables
 {
   my ($text) = @_;
-  $text =~ s/\${([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
+  $text =~ s/\$\{([^ \t=:+{}]+)\}/substitute_ac_subst_variables_worker ($1)/ge;
   return $text;
 }
 
-- 
2.6.4