utils/create_spatial_ref_sys_config_dump.pl has hardcoded perl path

[gdt]

This script starts with "#!/usr/bin/perl", but some systems (e.g. NetBSD/pkgsrc) do not include perl in the base system, placing it elsewhere (e.g. /usr/pkg/bin/perl).

Arguably the 100% correct solution is to substitute the perl path found by configure, but that's hard. Instead, use env to find perl

[gdt]

patch to use /usr/bin/env to find perl

[strk]

Note that postgis_upgrade.pl is generated at ./configure time from postgis_upgrade.pl.in, if you're looking for an example

[robe]

gdt,

I thought this line is ignored if perl is called explicitly. I think this is why I had the issue in #3639 which I fixed by explicitly calling the PERL we are using in r15135.

That said, I'm going to reject this patch and mark this ticket as a duplicate of #3639 for 2 reasons

1) Have no idea it's effect on other systems, and too scared to apply so close to release time 2) If we change this perl script, I would have to argue why aren't we changing the header of all the .pl scripts in utils folder which all have - #!/usr/bin/perl

So if we revisit this, I think we should have a patch that changes all the perl scripts.