[gn build] Enable check-bolt on Linux

It builds but not all tests pass, mostly due to missing libbolt_rt_instr.a.

Reviewed By: thakis

Differential Revision: https://reviews.llvm.org/D141881

llvm/utils/gn/secondary/BUILD.gn

@@ -32,8 +32,8 @@ group("default") {
     deps += [ "//libunwind" ]
   }
 
-  # FIXME: Add this on linux/win after testing that it builds.
-  if (current_os == "mac") {
+  # FIXME: Add this on win after testing that it builds.
+  if (current_os != "win") {
     deps += [ "//bolt/test" ]
   }