chore: Build libsodium with -fPIC for relocatable symbols. #581

Job	Run time
qtox-host-qt (6.2.4)	40s
buildfarm (server)	23s
qtox-host-qt (6.8.1)	25s
build (alpine-s390x)	31s
buildfarm (worker)	43s
build (bazel)	3m 43s
build (compcert)	24s
build (doxygen)	22s
build (flutter-web)	24s
build (frama-c)	27s
build (freebsd)	24s
build (haskell)	30s
build (pkgsrc)	32s
qtox (alpine)	17s
qtox (alpine-appimage)	38m 56s
qtox-android (armeabi-v7a, debug, 6.2.4)	18s
qtox (alpine-static)	26s
qtox-android (armeabi-v7a, debug, 6.8.1)	19s
qtox (debian)	56s
qtox-android (armeabi-v7a, release, 6.2.4)	18s
qtox-android (armeabi-v7a, release, 6.8.1)	18s
qtox (fedora)	51s
qtox (flatpak-builder)	26s
qtox-android (arm64-v8a, debug, 6.2.4)	18s
qtox (ubuntu-lts)	51s
qtox-android (arm64-v8a, debug, 6.8.1)	19s
qtox (windows-builder.i686)	36m 23s
qtox-android (arm64-v8a, release, 6.2.4)	20s
qtox (windows-builder.x86_64)	41m 8s
qtox-android (arm64-v8a, release, 6.8.1)	26s
	2h 12m 18s

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