chromium: fix libpci GPU detection

Chromium has blocklists that workaround various GPU driver bugs, either
by forcing software rendering [1] or by disabling use of certain GPU
features [2].

These blocklists can only be applied successfully if the GPU vendor and
device is detected correctly. One of the methods used for GPU detection
is to load libpci.so via dlopen() at runtime to read the PCI vendor and
device ID.

The current derivation already contains a sed command to rewrite the
dlopen() to the absolute path of libpci.so in the Nix store, namely

      sed -i -e '/libpci_loader.*Load/s!"\(libpci\.so\)!"${pciutils}/lib/\1!' \
        gpu/config/gpu_info_collector_linux.cc

However, in Chromium 59 (6 years ago), this code was moved into the
ANGLE library used by Chromium [3]. This sed command no longer works.
There is similar code in ANGLE now [4] that must be similarly patched to
ensure the GPU vendor and device is always detected correctly.

Without libpci some GPUs are not detected correctly. For example, in a
VMWare virtual machine opening chrome://gpu in the browser shows:

  VENDOR= 0x0000 [Google Inc. (VMware, Inc.)], DEVICE=0x0000 [ANGLE
   (VMware Inc., SVGA3D; build: RELEASE;  LLVM;, OpenGL 4.1 (Core Profile)
    Mesa 23.0.3)], DRIVER_VENDOR=Mesa, DRIVER_VERSION=23.0.3 *ACTIVE*

Note the VENDOR=0x0000 and DEVICE=0x0000. Adding libpci.so to the
library path fixes this:

  VENDOR= 0x15ad [Google Inc. (VMware, Inc.)], DEVICE=0x0405 [ANGLE
   (VMware Inc., SVGA3D; build: RELEASE;  LLVM;, OpenGL 4.1 (Core Profile)
    Mesa 23.0.3)], DRIVER_VENDOR=Mesa, DRIVER_VERSION=23.0.3 *ACTIVE*

Note the VENDOR=0x15ad and DEVICE=0x0405. Also now the blocklist entries
are applied correctly, fixing some graphical issues.

Fix this by adding pciutils to the rpath set with patchelf. This avoids
having to patch lines in the source code that might get moved around.

[1]: https://chromium.googlesource.com/chromium/src/+/e52f33f30b91b4ddfad649acddc39ab570473b86/gpu/config/software_rendering_list.json
[2]: https://chromium.googlesource.com/chromium/src/+/e52f33f30b91b4ddfad649acddc39ab570473b86/gpu/config/gpu_driver_bug_list.json
[3]: https://github.com/chromium/chromium/commit/873b27d518038be94df98d1128a2e8047e0ef942
[4]: https://github.com/google/angle/blob/05f45adc147393562b518ca1f82a3ccba7ee40f7/src/gpu_info_util/SystemInfo_libpci.cpp#L41

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