Log Message:
Make some adjustments to fix the issues from PR#54912:

 * Don't use DATE as a variable, as it's used elsewhere, use QJS_DATE instead
 * Don't use the "bignum" PLIST variable anymore, the "bn" \ 
variants are no
   longer being built
 * Add "lto" PLIST variable, supported by and used on Linux
 * Move the setting of CONFIG_BIGNUM to the pkg Makefile instead of
   always setting it, should support 32-bit NetBSD ports.

Bump PKGREVISION.