gnupload: don't hard-code /usr/bin/gpg

[Jim Meyering]

Hi,

I wanted to use gpg2 (trying to work around key change differences),
but could not, without changing the script.  So I made this change:

        * build-aux/gnupload (GPG): Don't hard-code patch to gpg binary.

diff --git a/build-aux/gnupload b/build-aux/gnupload
index 5b235c4..a0f7dc9 100755
--- a/build-aux/gnupload
+++ b/build-aux/gnupload
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Sign files and upload them.

-scriptversion=2007-06-30.12
+scriptversion=2007-12-15.10

 # Copyright (C) 2004, 2005, 2006, 2007  Free Software Foundation
 #
@@ -24,7 +24,7 @@ scriptversion=2007-06-30.12

 set -e

-GPG='/usr/bin/gpg --batch --no-tty'
+GPG='gpg --batch --no-tty'
 to=

 usage="Usage: $0 [OPTIONS]... FILES...