Fix locale issue in check-exported-srcdir.test.

[Ralf Wildenhues]

I had to merge this patch into maint in order to avoid a test failure
when LC_COLLATE=de_DE.UTF-8:

+ mkdir SrcDir BuildDir
+ mv BuildDir configure.in depcomp install-sh missing SrcDir SrcDir
mv: Verschieben von „SrcDir“ in eigenes Unterverzeichnis („SrcDir/SrcDir“) 
nicht möglich
+ exit_status=1

Thanks,
Ralf

    Fix locale issue in check-exported-srcdir.test.
    
    * tests/check-exported-srcdir.test: Reformulate glob to not fail
    in a locale that ignores or interleaves character case.

diff --git a/tests/check-exported-srcdir.test b/tests/check-exported-srcdir.test
index 9209fc8..430c9cc 100755
--- a/tests/check-exported-srcdir.test
+++ b/tests/check-exported-srcdir.test
@@ -32,9 +32,9 @@ show_info ()
   fi
 }
 
-mkdir SrcDir BuildDir
-
-mv [a-z]* SrcDir
+mkdir SrcDir
+mv [!S]* SrcDir
+mkdir BuildDir
 cd SrcDir
 
 cat >> configure.in << 'END'