browser(firefox): fix build on Windows (#5275)

browser_patches/firefox/BUILD_NUMBER

@@ -1,2 +1,2 @@
-1227
-Changed: lushnikov@chromium.org Mon 01 Feb 2021 03:46:01 PM PST
+1228
+Changed: lushnikov@chromium.org Wed Feb  3 08:52:41 MST 2021

browser_patches/firefox/juggler/pipe/nsRemoteDebuggingPipe.cpp

@@ -110,8 +110,8 @@ nsresult nsRemoteDebuggingPipe::Init(nsIRemoteDebuggingPipeClient* aClient) {
 #if defined(_WIN32)
   CHAR pipeReadStr[20];
   CHAR pipeWriteStr[20];
-  GetEnvironmentVariable("PW_PIPE_READ", pipeReadStr, 20);
-  GetEnvironmentVariable("PW_PIPE_WRITE", pipeWriteStr, 20);
+  GetEnvironmentVariableA("PW_PIPE_READ", pipeReadStr, 20);
+  GetEnvironmentVariableA("PW_PIPE_WRITE", pipeWriteStr, 20);
   readHandle = reinterpret_cast<HANDLE>(atoi(pipeReadStr));
   writeHandle = reinterpret_cast<HANDLE>(atoi(pipeWriteStr));
 #endif