WL#5030: Split and remove mysql_priv.h

This patch:

- Moves all definitions from the mysql_priv.h file into
  header files for the component where the variable is
  defined
- Creates header files if the component lacks one
- Eliminates all include directives from mysql_priv.h
- Eliminates all circular include cycles
- Rename time.cc to sql_time.cc
- Rename mysql_priv.h to sql_priv.h

include/m_string.h

@@ -20,6 +20,9 @@
 
 #ifndef _m_string_h
 #define _m_string_h
+
+#include "my_global.h"                          /* HAVE_* */
+
 #ifndef __USE_GNU
 #define __USE_GNU				/* We want to use stpcpy */
 #endif
@@ -266,13 +269,6 @@ extern ulonglong strtoull(const char *str, char **ptr, int base);
 #endif
 #define longlong2str(A,B,C) ll2str((A),(B),(C),1)
 
-/* my_vsnprintf.c */
-
-extern size_t my_vsnprintf(char *str, size_t n,
-                           const char *format, va_list ap);
-extern size_t my_snprintf(char *to, size_t n, const char *fmt, ...)
-  ATTRIBUTE_FORMAT(printf, 3, 4);
-
 #if defined(__cplusplus)
 }
 #endif
@@ -365,4 +361,10 @@ static inline const uchar *skip_trailing_space(const uchar *ptr,size_t len)
   return (end);
 }
 
+static inline void lex_string_set(LEX_STRING *lex_str, const char *c_str)
+{
+  lex_str->str= (char *) c_str;
+  lex_str->length= strlen(c_str);
+}
+
 #endif