make.bat should detect when Perl is not installed

[marstr]

System Information

Version:  v0.1.1-modified
System: windows/amd64
Go:  go1.12.7
Source Revision:  af91355be2f7c0d8e5ec5ea2843d2964b7ab0ff9

What did you do?

Clone this repository onto a Windows machine that does not have a perl install, and execute .\make.bat install

What did you expect to happen?

make.bat should fail and report that perl must be installed to continue.

What actually happened?

perl is invoked, but the installation continues anyway. This can lead to system information being reported that doesn't capture version/revision information, or even worse garbage being used for those values.

Stack Trace

[Copy&Paste the error message that you got here.]