community/gnu-libiconv: enable extra encodings

CP437 in particular which is unfortunately missing in the default set of
enable encodings.
7 jobs for !8702 with master in 2 minutes and 7 seconds
detached
Status Job ID Name Coverage
  Lint
failed #143766
x86_64 docker-alpine allowed to fail
lint

00:00:26

 
  Build
passed #143771
aarch64 ci-build docker-alpine
build-aarch64

00:01:18

passed #143772
armv7 ci-build docker-alpine
build-armv7

00:01:24

passed #143770
ppc64le ci-build docker-alpine
build-ppc64le

00:01:40

failed #143769
s390x ci-build docker-alpine
build-s390x

passed #143768
x86 ci-build docker-alpine
build-x86

00:00:55

passed #143767
x86_64 ci-build docker-alpine
build-x86_64

00:01:00

 
Name Stage Failure
failed
build-s390x Build There has been a timeout failure or the job got stuck. Check your timeout limits or try again
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failed
lint Lint
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