refactor: remove dc-strbuilder

misc.h

@@ -1,15 +1 @@
-#define DC_MAX(X, Y) (((X) > (Y))? (X) : (Y))
-
-typedef struct _dc_strbuilder dc_strbuilder_t;
-
-struct _dc_strbuilder
-{
-	char* buf;
-	int   allocated;
-	int   free;
-	char* eos;
-};
-
-
 char* dc_mprintf                 (const char* format, ...); /* The result must be free()'d. */
-void  dc_strbuilder_catf    (dc_strbuilder_t*, const char* format, ...);