pkg_rolling-replace and rust updates

[John Klos <john%klos.com@localhost>]

Why does this happen so often? It reminds me of the vim-share issue that 
we've had for many years.

Latest pkgsrc, NetBSD 10.1, via pkg_rolling-replace -suv:

...
=> Creating binary package /usr/pkgsrc/www/curl/work/.packages/curl-8.11.1nb1.tgz
===> package-message [curl-8.11.1nb1 rust-1.81.0 cargo-c-0.9.32 
libimagequant-4.3.3 gd-2.3.3nb14] ===> Building binary package for 
curl-8.11.1nb1
=> Creating binary package /usr/pkgsrc/packages/All/curl-8.11.1nb1.tgz
===> su-real-package-install [curl-8.11.1nb1 rust-1.81.0 cargo-c-0.9.32 
libimagequant-4.3.3 gd-2.3.3nb14] ===> Installing binary package of 
curl-8.11.1nb1
pkg_add: A different version of curl-8.11.1nb1 is already installed: 
curl-8.6.0
pkg_add: 1 package addition failed
*** Error code 1

Stop.
make[6]: stopped in /usr/pkgsrc/www/curl
*** Error code 1

Stop.
make[5]: stopped in /usr/pkgsrc/www/curl
*** Error code 1

Stop.
make[4]: stopped in /usr/pkgsrc/www/curl
*** Error code 1

Stop.
make[3]: stopped in /usr/pkgsrc/lang/rust
*** Error code 1

Stop.
make[2]: stopped in /usr/pkgsrc/devel/cargo-c
*** Error code 1

Stop.
make[1]: stopped in /usr/pkgsrc/graphics/libimagequant
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/graphics/gd
*** 'make replace' failed for package gd.
*** Please read the errors listed above, fix the problem,
*** then re-run pkg_rolling-replace to continue.