Use g_clear_signal_handler

We can rely on glib 2.62 now.

Signed-off-by: Guido Günther <guido.gunther@puri.sm>
13 jobs for bump-glib in 41 minutes and 12 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
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build:cross-debian-bullseye:i386

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build:native-alpinelinux-edge

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librem5
build:native-debian-bullseye

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librem5
build:cross-debian-bullseye:i386

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build:cross-debian-bullseye:i386

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librem5
build:cross-debian-bullseye:i386

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  Test+Docs
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build-gtkdoc

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check-po

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test:smoke:two-outputs

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unit-test:native-alpinelinux-edge

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librem5
unit-test:native-debian-bullseye

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  Package
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librem5:arm64
package:deb-debian-bullseye:arm64

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