Bug 1871461: Do not compile ETW support on MinGW. r=mstange,profiler-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D197256

tools/profiler/moz.build

@@ -107,8 +107,10 @@ if CONFIG["MOZ_GECKO_PROFILER"]:
             UNIFIED_SOURCES += [
                 "core/PowerCounters-win.cpp",
             ]
+            SOURCES += {
+                "core/ETWTools.cpp",
+            }
         SOURCES += [
-            "core/ETWTools.cpp",
             "core/ProfilerCPUFreq-win.cpp",
             "core/shared-libraries-win32.cc",
         ]