eliminate SK_BUILD_FOR_WIN32

SK_BUILD_FOR_WIN and SK_BUILD_FOR_WIN32 have long meant the same thing.

Chrome fix is https://chromium-review.googlesource.com/c/chromium/src/+/884007

Change-Id: I0e907b1bcd2a358eabf776f414fd3aeb3c689561
Reviewed-on: https://skia-review.googlesource.com/99340
Reviewed-by: Mike Reed <reed@google.com>
diff --git a/debugger/debuggermain.cpp b/debugger/debuggermain.cpp
index 30c2335..35c9560 100644
--- a/debugger/debuggermain.cpp
+++ b/debugger/debuggermain.cpp
@@ -18,7 +18,7 @@
 }
 
 int main(int argc, char *argv[]) {
-#ifndef SK_BUILD_FOR_WIN32
+#ifndef SK_BUILD_FOR_WIN
     // Set numeric formatting to default. Otherwise shaders will have numbers with wrong comma.
     // QApplication documentation recommends setlocale("LC_NUMERIC", "C") after QApplication
     // constuction.  However, the components Qt calls (X11 libs, ..) will override that.