respect to global download-rustc default in non-dist profiles

Signed-off-by: onur-ozkan <[email protected]>

Author: onur-ozkan

src/bootstrap/defaults/config.dist.toml

@@ -11,6 +11,7 @@ extended = true
 # Most users installing from source want to build all parts of the project from source.
 [llvm]
 download-ci-llvm = false
+
 [rust]
 # We have several defaults in bootstrap that depend on whether the channel is `dev` (e.g. `omit-git-hash` and `download-ci-llvm`).
 # Make sure they don't get set when installing from source.

src/bootstrap/defaults/config.library.toml

@@ -8,9 +8,6 @@ bench-stage = 0
 [rust]
 # This greatly increases the speed of rebuilds, especially when there are only minor changes. However, it makes the initial build slightly slower.
 incremental = true
-# Download rustc from CI instead of building it from source.
-# For stage > 1 builds, this cuts compile times significantly when there are no changes on "compiler" tree.
-download-rustc = "if-unchanged"
 # Make the compiler and standard library faster to build, at the expense of a ~20% runtime slowdown.
 lto = "off"
 

src/bootstrap/defaults/config.tools.toml

@@ -3,11 +3,6 @@
 [rust]
 # This greatly increases the speed of rebuilds, especially when there are only minor changes. However, it makes the initial build slightly slower.
 incremental = true
-# Download rustc from CI instead of building it from source.
-# For stage > 1 builds, this cuts compile times significantly when there are no changes on "compiler" tree.
-# Using these defaults will download the stage2 compiler (see `download-rustc`
-# setting) and the stage2 toolchain should therefore be used for these defaults.
-download-rustc = "if-unchanged"
 
 [build]
 # Document with the in-tree rustdoc by default, since `download-rustc` makes it quick to compile.