[Minor] Fix build

contrib/replxx/src/conversion.hxx

@@ -1,14 +1,19 @@
 #ifndef REPLXX_CONVERSION_HXX_INCLUDED
 #define REPLXX_CONVERSION_HXX_INCLUDED 1
 
-#include "ConvertUTF.h"
-
 #ifdef __has_include
 #if __has_include( <version> )
 #include <version>
 #endif
 #endif
 
+typedef enum {
+	conversionOK,    /* conversion successful */
+	sourceExhausted, /* partial character in source, but hit end */
+	targetExhausted, /* insuff. room in target for conversion */
+	sourceIllegal    /* source sequence is illegal/malformed */
+} ConversionResult;
+
 #if ! ( defined( __cpp_lib_char8_t ) || ( defined( __clang_major__ ) && ( __clang_major__ >= 8 ) && ( __cplusplus > 201703L ) ) )
 namespace replxx {
 typedef unsigned char char8_t;

contrib/replxx/src/unicodestring.hxx

@@ -3,6 +3,7 @@
 
 #include <vector>
 #include <cstring>
+#include <string>
 
 #include "conversion.hxx"