Auto merge of #21902 - ferjm:windows.installer.locate.gst, r=jdm
Auto merge of #21902 - ferjm:windows.installer.locate.gst, r=jdm

Windows installer: set GStreamer installation path based on registry …

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #21839

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jimberlage/servo,larsbergstrom/servo,larsbergstrom/servo,paulrouget/servo,splav/servo,KiChjang/servo,sadmansk/servo,larsbergstrom/servo,peterjoel/servo,szeged/servo,notriddle/servo,sadmansk/servo,notriddle/servo,szeged/servo,emilio/servo,jimberlage/servo,nnethercote/servo,DominoTree/servo,sadmansk/servo,splav/servo,nnethercote/servo,jimberlage/servo,KiChjang/servo,pyfisch/servo,szeged/servo,nnethercote/servo,saneyuki/servo,DominoTree/servo,pyfisch/servo,emilio/servo,paulrouget/servo,notriddle/servo,KiChjang/servo,pyfisch/servo,saneyuki/servo,KiChjang/servo,peterjoel/servo,paulrouget/servo,KiChjang/servo,KiChjang/servo,paulrouget/servo,larsbergstrom/servo,sadmansk/servo,splav/servo,DominoTree/servo,larsbergstrom/servo,splav/servo,larsbergstrom/servo,splav/servo,nnethercote/servo,KiChjang/servo,larsbergstrom/servo,notriddle/servo,emilio/servo,notriddle/servo,notriddle/servo,nnethercote/servo,sadmansk/servo,szeged/servo,sadmansk/servo,peterjoel/servo,larsbergstrom/servo,paulrouget/servo,sadmansk/servo,paulrouget/servo,emilio/servo,szeged/servo,peterjoel/servo,paulrouget/servo,DominoTree/servo,sadmansk/servo,pyfisch/servo,pyfisch/servo,notriddle/servo,jimberlage/servo,jimberlage/servo,notriddle/servo,paulrouget/servo,DominoTree/servo,notriddle/servo,saneyuki/servo,saneyuki/servo,pyfisch/servo,nnethercote/servo,emilio/servo,splav/servo,jimberlage/servo,szeged/servo,szeged/servo,paulrouget/servo,emilio/servo,saneyuki/servo,DominoTree/servo,jimberlage/servo,KiChjang/servo,saneyuki/servo,emilio/servo,saneyuki/servo,peterjoel/servo,pyfisch/servo,notriddle/servo,DominoTree/servo,peterjoel/servo,KiChjang/servo,nnethercote/servo,saneyuki/servo,paulrouget/servo,jimberlage/servo,peterjoel/servo,splav/servo,pyfisch/servo,peterjoel/servo,DominoTree/servo,pyfisch/servo,szeged/servo,szeged/servo,nnethercote/servo,splav/servo,splav/servo,pyfisch/servo,peterjoel/servo,KiChjang/servo,nnethercote/servo,emilio/servo,saneyuki/servo,szeged/servo,emilio/servo,DominoTree/servo,DominoTree/servo,nnethercote/servo,splav/servo,jimberlage/servo,larsbergstrom/servo,peterjoel/servo,emilio/servo,larsbergstrom/servo,saneyuki/servo