Bug 1720908 - Port bug 1720625: Add sysroots to Windows/macOS builds for host utilities. r=justdave

Necessary to compile things like nsinstall which run on the Linux host during
the build.

Differential Revision: https://phabricator.services.mozilla.com/D120081

--HG--
extra : amend_source : a6643e2b4c136a6f192998f3ce44c6f227fa967c

taskcluster/ci/build/macosx.yml

@@ -31,6 +31,7 @@ job-defaults:
             - linux64-node
             - linux64-rust-macos
             - linux64-rust-size
+            - sysroot-x86_64-linux-gnu
 
 macosx64/debug:
     description: "MacOS X x64 Cross-compile"

taskcluster/ci/build/windows.yml

@@ -64,6 +64,7 @@ win32/opt:
             - linux64-sccache
             - linux64-winchecksec
             - linux64-wine
+            - sysroot-x86_64-linux-gnu
             - win32-libotr
         fetch:
             - nsis-3.01-win
@@ -123,6 +124,7 @@ win32-shippable/opt:
             - linux64-rust-size
             - linux64-winchecksec
             - linux64-wine
+            - sysroot-x86_64-linux-gnu
             - win32-libotr
         fetch:
             - nsis-3.01-win
@@ -179,6 +181,7 @@ win32/debug:
             - linux64-sccache
             - linux64-winchecksec
             - linux64-wine
+            - sysroot-x86_64-linux-gnu
             - win32-libotr
         fetch:
             - nsis-3.01-win
@@ -234,6 +237,7 @@ win64/opt:
             - linux64-sccache
             - linux64-winchecksec
             - linux64-wine
+            - sysroot-x86_64-linux-gnu
             - win64-libotr
         fetch:
             - nsis-3.01-win
@@ -293,6 +297,7 @@ win64-shippable/opt:
             - linux64-rust-size
             - linux64-winchecksec
             - linux64-wine
+            - sysroot-x86_64-linux-gnu
             - win64-libotr
         fetch:
             - nsis-3.01-win
@@ -349,6 +354,7 @@ win64/debug:
             - linux64-sccache
             - linux64-winchecksec
             - linux64-wine
+            - sysroot-x86_64-linux-gnu
             - win64-libotr
         fetch:
             - nsis-3.01-win
@@ -486,6 +492,7 @@ win64-asan/opt:
             - linux64-sccache
             - linux64-winchecksec
             - linux64-wine
+            - sysroot-x86_64-linux-gnu
             - win64-libotr
             - win64-llvm-symbolizer
         fetch:

taskcluster/ci/searchfox/kind.yml

@@ -104,6 +104,7 @@ jobs:
                 - linux64-rust-macos
                 - macosx64-x64-libotr
                 - macosx64-sdk-10.12
+                - sysroot-x86_64-linux-gnu
 
     win64-searchfox/debug:
         description: "Win64 Searchfox Debug (clang)"
@@ -153,6 +154,7 @@ jobs:
                 - linux64-sccache
                 - linux64-winchecksec
                 - linux64-wine
+                - sysroot-x86_64-linux-gnu
                 - win64-libotr
             fetch:
                 - nsis-3.01-win