www-client/chromium: do a better job of forcing ClangHEADmaster

When enabling the Rust eclass, we started directly using
`llvm-r1_pkg_setup`, assuming that this combination would be
sufficicent, however due to forcing `CC` (etc) to variations
on `${CHOST}-clang" _before_ calling `llvm-r1_pkg_setup`,
these would always be forced to the newest version in
`PATH` instead of the one matching `LLVM_SLOT` due to
the eclass fixing the version before doing any `PATH`
manipulation.

To ensure a consistent build environment, we will:

1. Explicitly include `-${LLVM_SLOT}` in `CC`, `CPP`, `CXX`
2. Set these variables (and `AR` and `NM`) after `llvm-r1_pkg_setup`
   has done its PATH manipulation.

Bug: https://bugs.gentoo.org/935689
Signed-off-by: Matt Jolly <kangie@gentoo.org>

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