#55 install-sh in 0.91 is broken

[Matthew Brown]

The version of install-sh in the package is broken; it does not support installing more than one file at the same time, and the generated makefile in the include/ directory relies on being able to do that. Only the first include file actually gets installed.

Replacing install-sh with the version from GNU Autoconf 2.68 makes 'make install' work as intended.

Please update this file.

I am building on Solaris 10, and Solaris' 'install' command is not acceptable to configure, so it tries to use the bundled script and fails to install properly. I suspect on Linux this is not an issue.