Add back UTF-32 for now and fix a MSVC build issue

source/common/ucnv_bld.cpp

Index: source/common/ucnv_bld.cpp
diff --git a/source/common/ucnv_bld.cpp b/source/common/ucnv_bld.cpp
index 3c6b0e3e159f95f7beb22ec9d1729ab5ab2234a4..77fd0e6da9584a79b2542a92ab4f76db0bf6c3c7 100644
--- a/source/common/ucnv_bld.cpp
+++ b/source/common/ucnv_bld.cpp
@@ -65,11 +65,7 @@ converterData[UCNV_NUMBER_OF_SUPPORTED_CONVERTER_TYPES]={
 
     &_Latin1Data,
     &_UTF8Data, &_UTF16BEData, &_UTF16LEData,
-#if UCONFIG_ONLY_HTML_CONVERSION
-    NULL, NULL,
-#else
     &_UTF32BEData, &_UTF32LEData,
-#endif
     NULL,
 
 #if UCONFIG_NO_LEGACY_CONVERSION
@@ -103,7 +99,7 @@ converterData[UCNV_NUMBER_OF_SUPPORTED_CONVERTER_TYPES]={
 
     &_ASCIIData,
 #if UCONFIG_ONLY_HTML_CONVERSION
-    NULL, NULL, &_UTF16Data, NULL, NULL, NULL,
+    NULL, NULL, &_UTF16Data, &_UTF32Data, NULL, NULL,
 #else
     &_UTF7Data, &_Bocu1Data, &_UTF16Data, &_UTF32Data, &_CESU8Data, &_IMAPData,
 #endif
@@ -168,7 +164,6 @@ static struct {
   { "utf16oppositeendian", UCNV_UTF16_BigEndian},
   { "utf16platformendian", UCNV_UTF16_LittleEndian },
 #endif
-#if !UCONFIG_ONLY_HTML_CONVERSION
   { "utf32", UCNV_UTF32 },
   { "utf32be", UCNV_UTF32_BigEndian },
   { "utf32le", UCNV_UTF32_LittleEndian },
@@ -179,7 +174,6 @@ static struct {
   { "utf32oppositeendian", UCNV_UTF32_BigEndian },
   { "utf32platformendian", UCNV_UTF32_LittleEndian },
 #endif
-#endif
 #if !UCONFIG_ONLY_HTML_CONVERSION
   { "utf7", UCNV_UTF7 },
 #endif