GCalc: removed libvala dependency

Now GCalc depends only on GLib for GLib.Scanner
5 jobs for master in 13 minutes and 2 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #332640
build:fedora

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passed #332642
allowed to fail
build:snap

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passed #332641
build:ubuntu

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  Test
passed #332644
test:fedora

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passed #332643
test:ubuntu

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