community/qt5-qtwebengine: restore core functionality

Qt 5.15.1 introduced a new check to see if glibc is available and if not
cripples functionality. However, it works fine with Musl and there is no
need to disable it. I missed this in the last upgrade, let's restore
functionality
7 jobs for !12581 with fix-qt5-qtwebengine in 46 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
passed #209667
x86_64 docker-alpine
lint

00:00:22

 
  Build
failed #209672
aarch64 ci-build docker-alpine
build-aarch64

00:00:12

failed #209673
armv7 ci-build docker-alpine
build-armv7

00:00:10

failed #209671
ppc64le ci-build docker-alpine
build-ppc64le

00:00:09

failed #209670
s390x ci-build docker-alpine
build-s390x

00:00:05

failed #209669
x86 ci-build docker-alpine
build-x86

00:00:07

failed #209668
x86_64 ci-build docker-alpine
build-x86_64

00:00:07

 
Name Stage Failure
failed
build-aarch64 Build
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failed
build-s390x Build
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build-armv7 Build
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build-ppc64le Build
No job log
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build-x86_64 Build
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build-x86 Build
No job log