[tintd] Simplify installation

* Remove the CMake TINT_INSTALL_TINTD flag: it doesn't install, just use TINT_BUILD_TINTD.
* Make the default of './tools/run tintd install' copy instead of symlink.
* Enable TINT_BUILD_TINTD with setup-build.

Bug: tint:2127
Change-Id: I6a5b439225445cabe6d6bf5f20fe959c559728ac
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/180484
Commit-Queue: Ben Clayton <bclayton@google.com>
Kokoro: Ben Clayton <bclayton@google.com>
Reviewed-by: David Neto <dneto@google.com>
diff --git a/tools/setup-build b/tools/setup-build
index 16f0558..fc2aff2 100755
--- a/tools/setup-build
+++ b/tools/setup-build
@@ -163,6 +163,7 @@
     CMAKE_FLAGS+=("-DTINT_BUILD_MSL_WRITER=1")
     CMAKE_FLAGS+=("-DTINT_BUILD_SPV_WRITER=1")
     CMAKE_FLAGS+=("-DTINT_BUILD_WGSL_WRITER=1")
+    CMAKE_FLAGS+=("-DTINT_BUILD_TINTD=1")
     CMAKE_FLAGS+=("-DDAWN_BUILD_NODE_BINDINGS=1")
     if [[ -x $(command -v ccache) ]]; then
       CMAKE_FLAGS+=("-DCMAKE_CXX_COMPILER_LAUNCHER=ccache")