Name the default configure log filename as "config.log" rather than

"config.err". The former name was misleading, as the file contains
useful information not necessarily related to errors.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@23630 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -61,7 +61,7 @@ Options: [defaults in brackets after descriptions]
 
 Standard options:
   --help                   print this message
-  --logfile=FILE           log tests and output to FILE [config.err]
+  --logfile=FILE           log tests and output to FILE [config.log]
   --disable-logging        do not log configure debug information
   --prefix=PREFIX          install in PREFIX [$prefix]
   --bindir=DIR             install binaries in DIR [PREFIX/bin]
@@ -1440,7 +1440,7 @@ doc_deps="texi2html"
 
 # default parameters
 
-logfile="config.err"
+logfile="config.log"
 
 # installation paths
 prefix_default="/usr/local"