JVET-AC0166: Set C++ version to C++17

As decided with software style guide update.

CMakeLists.txt

@@ -41,8 +41,8 @@ if( CMAKE_COMPILER_IS_GNUCC )
   set( BUILD_STATIC OFF CACHE BOOL "Build static executables" )
 endif()
 
-# set c++14
-set( CMAKE_CXX_STANDARD 14 )
+# set c++17
+set( CMAKE_CXX_STANDARD 17 )
 set( CMAKE_CXX_STANDARD_REQUIRED ON )
 
 # compile everything position independent (even static libraries)

source/Lib/libmd5/libmd5.cpp

@@ -174,7 +174,7 @@ void MD5Final(unsigned char digest[16], context_md5_t *ctx)
  */
 static void MD5Transform(uint32_t buf[4], uint32_t const in[16])
 {
-  register uint32_t a, b, c, d;
+  uint32_t a, b, c, d;
 
   a = buf[0];
   b = buf[1];