Bug 1806510 - Vendor libwebrtc from 1d5be49ff2 - moz.build file updates

CLOBBER

@@ -25,4 +25,5 @@
 A recent ANGLE vendoring update from <https://bugzilla.mozilla.org/show_bug.cgi?id=1753349> causes
 a failure like the following:
 
-> No rule to make target `/Users/jkew/mozdev/mozilla-unified/gfx/angle/checkout/src/compiler/translator/tree_ops/gl/RecordConstantPrecision.cpp
+Modified build files in third_party/libwebrtc - Bug 1806510 - Vendor libwebrtc from 1d5be49ff2
+

third_party/libwebrtc/rtc_base/rtc_event_gn/moz.build

@@ -126,6 +126,10 @@ if CONFIG["OS_TARGET"] == "WINNT":
     DEFINES["_WINDOWS"] = True
     DEFINES["__STD_C"] = True
 
+    OS_LIBS += [
+        "winmm"
+    ]
+
 if CONFIG["CPU_ARCH"] == "aarch64":
 
     DEFINES["WEBRTC_ARCH_ARM64"] = True