src: disable unfixable MSVC warnings

The following warnings are disabled:
- C4065 in node_revert.h: there are no security reversions on the master
  branch.
- C4003 in base64-inl.h: a macro is used four times, only once without
  parameters.

src/base64-inl.h

@@ -23,6 +23,11 @@ inline uint32_t ReadUint32BE(const unsigned char* p) {
          static_cast<uint32_t>(p[3]);
 }
 
+#ifdef _MSC_VER
+#pragma warning(push)
+// MSVC C4003: not enough actual parameters for macro 'identifier'
+#pragma warning(disable : 4003)
+#endif
 
 template <typename TypeName>
 bool base64_decode_group_slow(char* const dst, const size_t dstlen,
@@ -50,6 +55,9 @@ bool base64_decode_group_slow(char* const dst, const size_t dstlen,
   return true;  // Continue decoding.
 }
 
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
 
 template <typename TypeName>
 size_t base64_decode_fast(char* const dst, const size_t dstlen,

src/node_revert.h

@@ -28,6 +28,12 @@ namespace per_process {
 extern unsigned int reverted_cve;
 }
 
+#ifdef _MSC_VER
+#pragma warning(push)
+// MSVC C4065: switch statement contains 'default' but no 'case' labels
+#pragma warning(disable : 4065)
+#endif
+
 inline const char* RevertMessage(const reversion cve) {
 #define V(code, label, msg) case SECURITY_REVERT_##code: return label ": " msg;
   switch (cve) {
@@ -38,6 +44,10 @@ inline const char* RevertMessage(const reversion cve) {
 #undef V
 }
 
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
 inline void Revert(const reversion cve) {
   per_process::reverted_cve |= 1 << cve;
   printf("SECURITY WARNING: Reverting %s\n", RevertMessage(cve));