libshared: move md5 to BPrivate namespace

Otherwise it clashes with the implementation in OpenSSL which uses the
same names but now has a different ABI.

Change-Id: I5cb3ff97d7b28de978cdcbd8a06f25f65fb53784
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2854
Reviewed-by: Kyle Ambroff-Kao <[email protected]>
Reviewed-by: Jérôme Duval <[email protected]>

headers/private/shared/md5.h

@@ -25,9 +25,7 @@
 #ifndef _MD5_H
 #define _MD5_H
 
-#ifdef __cplusplus
-extern "C" {
-#endif
+namespace BPrivate {
 
 /* Any 32-bit or wider unsigned integer data type will do */
 typedef unsigned int MD5_u32plus;
@@ -43,8 +41,8 @@ extern void MD5_Init(MD5_CTX *ctx);
 extern void MD5_Update(MD5_CTX *ctx, const void *data, unsigned long size);
 extern void MD5_Final(unsigned char *result, MD5_CTX *ctx);
 
-#ifdef __cplusplus
 };
-#endif
+
+using namespace BPrivate;
 
 #endif