Switching back to __builtin_bswap32.

ports/glibc-compat/include/machine/endian.h

Index: ports/glibc-compat/include/machine/endian.h
diff --git a/ports/glibc-compat/include/machine/endian.h b/ports/glibc-compat/include/machine/endian.h
index 497fdd44cc8040586320953bb7f998f3567bc51d..4e4f4185773a8253faf388a5d3d6f615f62b0519 100644
--- a/ports/glibc-compat/include/machine/endian.h
+++ b/ports/glibc-compat/include/machine/endian.h
@@ -27,17 +27,11 @@ __inline_bswap_16 (unsigned short int x)
     return __byte_swap_constant_16(x);
 }
 
-_ELIDABLE_INLINE unsigned long int
-__inline_bswap_32 (unsigned long int x)
-{
-    return __byte_swap_constant_32(x);
-}
-
 #define __byte_swap_16(x) \
   (__builtin_constant_p(x) ? __byte_swap_constant_16(x) : __inline_bswap_16(x))
 
 #define __byte_swap_32(x) \
-  (__builtin_constant_p(x) ? __byte_swap_constant_32(x) : __inline_bswap_32(x))
+  (__builtin_constant_p(x) ? __byte_swap_constant_32(x) : __builtin_bswap32(x))
 
 #define ntohs(x)   (unsigned int)__byte_swap_16(x)
 #define ntohl(x)   (unsigned int)__byte_swap_32(x)