Undo accidental BUILD.gn change

aosp/958687 accidentally pulled this, likely a merge conflict.

TBR: hjd
Change-Id: Ief215023bd88f4efd0c38030da5990f5b37dc95e
diff --git a/gn/standalone/toolchain/BUILD.gn b/gn/standalone/toolchain/BUILD.gn
index 9c7bfdb..fcbc9e1 100644
--- a/gn/standalone/toolchain/BUILD.gn
+++ b/gn/standalone/toolchain/BUILD.gn
@@ -26,7 +26,7 @@
     if (is_system_compiler) {
       cc = "\$CC "
       cxx = "\$CXX "
-    } else if (is_linux_host) {
+    } else if (is_linux) {
       cc = linux_clang_bin
       cxx = linux_clangxx_bin
       linker = linux_clang_linker