community/glib-networking: replace gnutls with openssl

The main SSL/TLS library we use in Alpine is OpenSSL. Also, GnuTLS
is quite a huge dependency.
8 jobs for !24458 with glib-networking-openssl in 2 minutes and 35 seconds (queued for 3 seconds)
latest detached
Status Job ID Name Coverage
  Lint
passed lint #490491
docker-alpine x86_64

00:00:19

 
  Build
passed build-aarch64 #490496
docker-alpine ci-build aarch64

00:01:09

passed build-armhf #490498
docker-alpine ci-build armhf

00:01:10

passed build-armv7 #490497
docker-alpine ci-build armv7

00:01:10

passed build-ppc64le #490495
docker-alpine ci-build ppc64le

00:01:24

passed build-s390x #490494
docker-alpine ci-build s390x

00:00:38

passed build-x86 #490493
docker-alpine ci-build x86

00:00:36

passed build-x86_64 #490492
docker-alpine ci-build x86_64

00:00:34