Revert "adb: move adb_strerror to sysdeps/win32/errno.cpp."

This reverts commit 4fba3d2638ecec0f87fe8d8913490bfbd7234d19.
diff --git a/adb/sysdeps.h b/adb/sysdeps.h
index 654072c..05d9fde 100644
--- a/adb/sysdeps.h
+++ b/adb/sysdeps.h
@@ -34,7 +34,6 @@
 #include <android-base/unique_fd.h>
 #include <android-base/utf8.h>
 
-#include "sysdeps/errno.h"
 #include "sysdeps/stat.h"
 
 /*
@@ -362,6 +361,9 @@
 
 #define getcwd adb_getcwd
 
+char* adb_strerror(int err);
+#define strerror adb_strerror
+
 // Helper class to convert UTF-16 argv from wmain() to UTF-8 args that can be
 // passed to main().
 class NarrowArgs {