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configure.ac: Use echo|tr to change PROGRAM_PREFIX case

The ${VAR,} syntax seems to be new to Bash 4, and thus not portable
to older versions or other shells.

--- a/configure.ac

+++ b/configure.ac

@@ -141,10 +141,11 @@

 WINDOWS_RC_VERSION=`echo $PACKAGE_VERSION | sed 's/-.*//; s/\./, /g; s/$/, 0/'`

-PROGRAM_PREFIX=${PACKAGE_SHORTNAME,}-

-

 dnl Without a hyphen. This is used for the bash-completion scripts.

-PROGRAM_SPREFIX=${PACKAGE_SHORTNAME,}

+PROGRAM_SPREFIX=$(echo $PACKAGE_SHORTNAME | tr A-Z a-z)

+

+dnl With a hyphen, used almost everywhere else.

+PROGRAM_PREFIX=${PROGRAM_SPREFIX}-

 AC_SUBST(PROGRAM_PREFIX)

 AC_DEFINE_UNQUOTED(PROGRAM_PREFIX, "$PROGRAM_PREFIX",