Test for _WIN32 in instead of USE_MINGW.

Bug: http://b/23392815
Test: builds
Change-Id: I7fce8de1f0e2314170cce456cd49346dcee9d134
diff --git a/libsparse/sparse_read.c b/libsparse/sparse_read.c
index dbb4dab..a188202 100644
--- a/libsparse/sparse_read.c
+++ b/libsparse/sparse_read.c
@@ -79,7 +79,7 @@
 		s = " at ";
 	}
 	if (verbose) {
-#ifndef USE_MINGW
+#ifndef _WIN32
 		if (err == -EOVERFLOW) {
 			sparse_print_verbose("EOF while reading file%s%s\n", s, at);
 		} else