[FFmpeg-cvslog] configure: make makeinfo_html check more robust

[Andreas Cadhalpun]

ffmpeg | branch: release/2.7 | Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com> | Sat Jun 13 20:24:27 2015 +0200| [73e7fe8e648a9d666338691fd30c6c080ee808b1] | committer: Andreas Cadhalpun

configure: make makeinfo_html check more robust

The current check is too strict for newer makeinfo versions.
Existing version strings are:
makeinfo (GNU texinfo) 4.13
makeinfo (GNU texinfo) 5.2
texi2any (GNU texinfo) 5.9.93

Probably version 6 will come in the not too far future.

Reviewed-by: Timothy Gu <timothygu99 at gmail.com>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
(cherry picked from commit 72654526e4489c0aac05d25cfeca5bbba26026b3)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=73e7fe8e648a9d666338691fd30c6c080ee808b1
---

 configure |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 06a9941..3960b73 100755
--- a/configure
+++ b/configure
@@ -5239,8 +5239,8 @@ disabled securetransport || { check_func SecIdentityCreate "-Wl,-framework,CoreF
     enable securetransport; }
 
 makeinfo --version > /dev/null 2>&1 && enable makeinfo  || disable makeinfo
-enabled makeinfo && (makeinfo --version | \
-                     grep -q 'makeinfo (GNU texinfo) 5' > /dev/null 2>&1) \
+enabled makeinfo \
+    && [ 0$(makeinfo --version | grep "texinfo" | sed 's/.*texinfo[^0-9]*\([0-9]*\)\..*/\1/') -ge 5 ] \
     && enable makeinfo_html || disable makeinfo_html
 disabled makeinfo_html && texi2html --help 2> /dev/null | grep -q 'init-file' && enable texi2html || disable texi2html
 perl -v            > /dev/null 2>&1 && enable perl      || disable perl