Modified to use PACKAGE_VERSION to the initial value

Since it became an error at the time of configure, it changed so that PACKAGE_VERSION might be used for an initial value.
```
# ./configure --with-build-version="1.0"
(snip)
configure: Sanitizing exec_prefix: NONE
./configure: line 10217: syntax error near unexpected token `fi'
./configure: line 10217: `fi'
```