libraw1394: 2.1.1 -> 2.1.2

Semi-automatic update. These checks were performed:

- built on NixOS
- ran `/nix/store/qxim1bskvnx2i91zlyblc62npb2m6yw1-libraw1394-2.1.2/bin/testlibraw -h` got 0 exit code
- ran `/nix/store/qxim1bskvnx2i91zlyblc62npb2m6yw1-libraw1394-2.1.2/bin/testlibraw --help` got 0 exit code
- ran `/nix/store/qxim1bskvnx2i91zlyblc62npb2m6yw1-libraw1394-2.1.2/bin/testlibraw help` got 0 exit code
- ran `/nix/store/qxim1bskvnx2i91zlyblc62npb2m6yw1-libraw1394-2.1.2/bin/sendiso -h` got 0 exit code
- ran `/nix/store/qxim1bskvnx2i91zlyblc62npb2m6yw1-libraw1394-2.1.2/bin/sendiso --help` got 0 exit code
- ran `/nix/store/qxim1bskvnx2i91zlyblc62npb2m6yw1-libraw1394-2.1.2/bin/dumpiso -h` got 0 exit code
- ran `/nix/store/qxim1bskvnx2i91zlyblc62npb2m6yw1-libraw1394-2.1.2/bin/dumpiso --help` got 0 exit code
- found 2.1.2 with grep in /nix/store/qxim1bskvnx2i91zlyblc62npb2m6yw1-libraw1394-2.1.2
- found 2.1.2 in filename of file in /nix/store/qxim1bskvnx2i91zlyblc62npb2m6yw1-libraw1394-2.1.2

cc "@wkennington"