lol

gnupg: fix cross compilation

when `npth` upgraded 1.6 -> 1.7, the `npth-config` binary it previously
provided was removed, and functionality folded into `gpgrt-config`. see:
<https://github.com/gpg/npth/blob/417abd56fd7bf45cd4948414050615cb1ad59134/NEWS#L8>

Colin d5998390 b7d77e74

+1 -1
+1 -1
pkgs/tools/security/gnupg/24.nix
··· 50 50 "--with-libgcrypt-prefix=${libgcrypt.dev}" 51 51 "--with-libassuan-prefix=${libassuan.dev}" 52 52 "--with-ksba-prefix=${libksba.dev}" 53 - "--with-npth-prefix=${npth}" 53 + "GPGRT_CONFIG=${lib.getDev libgpg-error}/bin/gpgrt-config" 54 54 ] 55 55 ++ lib.optional guiSupport "--with-pinentry-pgm=${pinentry}/${pinentry.binaryPath or "bin/pinentry"}" 56 56 ++ lib.optional withTpm2Tss "--with-tss=intel"