ci(pr.yml): refine build matrix targets and variants

- Remove `win64` from the build matrix targets.
- Update and expand the list of build variants to include new GPL, LGPL versions, and nonfree options.

.github/workflows/pr.yml

@@ -17,8 +17,8 @@ jobs:
  strategy:
  fail-fast: false
  matrix:
- target: [win64,linux64,linuxarm64]
- variant: [lgpl,gpl 6.1,gpl 5.1,lgpl 6.1,lgpl 5.1,gpl-shared,lgpl-shared,gpl-shared 6.1,gpl-shared 5.1,lgpl-shared 6.1,lgpl-shared 5.1]
+ target: [linux64,linuxarm64]
+ variant: [gpl,lgpl,gpl 6.1,gpl 7.0,lgpl 6.1,lgpl 7.0,gpl-shared,lgpl-shared,gpl-shared 6.1,gpl-shared 7.0,lgpl-shared 6.1,lgpl-shared 7.0,nonfree 6.1,nonfree-shared 6.1,nonfree 7.0,nonfree-shared 7.0]
  quickbuild: [1]
  include:
  - target: win64