Bootstrap and 4-argument AC_INITs

[Sergey Poznyakoff]

Hello,

The following fixes package name extraction from 4-argument AC_INIT
invocations:

diff --git a/build-aux/bootstrap b/build-aux/bootstrap
index 0e2bd34..1034ca3 100755
--- a/build-aux/bootstrap
+++ b/build-aux/bootstrap
@@ -77,9 +77,10 @@ po_download_command_format=\
 
 extract_package_name='
   /^AC_INIT(/{
-     /.*,.*,.*,/{
+     /.*,.*,.*, */{
        s///
        s/[][]//g
+       s/)$//
        p
        q
      }

Regards,
Sergey