seems like both musl libc and android has byteswap.h

diff --git a/src/google/protobuf/stubs/port.h b/src/google/protobuf/stubs/port.h
--- a/src/google/protobuf/stubs/port.h
+++ b/src/google/protobuf/stubs/port.h
@@ -93,7 +93,7 @@
 #include <stdlib.h>  // NOLINT(build/include)
 #elif defined(__APPLE__)
 #include <libkern/OSByteOrder.h>
-#elif defined(__GLIBC__) || defined(__CYGWIN__)
+#elif defined(__linux__) || defined(__CYGWIN__)
 #include <byteswap.h>  // IWYU pragma: export
 #endif
 
@@ -366,7 +366,7 @@
 #define bswap_32(x) OSSwapInt32(x)
 #define bswap_64(x) OSSwapInt64(x)
 
-#elif !defined(__GLIBC__) && !defined(__CYGWIN__)
+#elif !defined(__linux__) && !defined(__CYGWIN__)
 
 static inline uint16 bswap_16(uint16 x) {
   return static_cast<uint16>(((x & 0xFF) << 8) | ((x & 0xFF00) >> 8));