librsvg_crate: remove bool arguments from loader

The options are false by default, we just need methods to turn them
on. Also change unlimited_size() to with_unlimited_size().
7 jobs for api in 4 minutes and 51 seconds (queued for 2 seconds)
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Status Job ID Name Coverage
  Test
failed #226343
fedora test

00:04:51

 
  Lint
skipped #226345
allowed to fail manual
clippy
skipped #226344
allowed to fail manual
rustfmt
skipped #226346
tarball
 
  Cross Distro
skipped #226349
debian_i386:testing
skipped #226348
debian:testing
skipped #226347
fedora:rawhide
 
Name Stage Failure
failed
fedora test Test
make[2]: *** [Makefile:1706: check-am] Error 2
make[1]: Leaving directory '/builds/pborelli/librsvg/_build'
make[1]: *** [Makefile:1412: check-recursive] Error 1
make: *** [Makefile:1708: check] Error 2
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ERROR: Job failed: exit code 1