www/chromium: unbreak with libglvnd
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ERROR at //build/config/linux/pkg_config.gni:103:17: Script returned non-zero exit code.
pkgresult = exec_script(pkg_config_script, args, "value") ^----------
Package gbm was not found in the pkg-config search path.
Perhaps you should add the directory containing `gbm.pc'
to the PKG_CONFIG_PATH environment variable
Package 'gbm', required by 'virtual:world', not found
Could not run pkg-config.
See //third_party/minigbm/BUILD.gn:122:3: whence it was called.
pkg_config("libgbm") { ^---------------------
See //ui/gfx/linux/BUILD.gn:41:5: which caused the file to be included.
"//third_party/minigbm", ^----------------------