writeV6Config: cast booleans to int

The tinyxml2 library used by Arch Linux represents
booleans as "true" and "false" instead of "0" and "1".

These fail to load when read back later and will always be
interpreted as false, as seen in
#343 .

Cast the booleans to int to force representation
as "0" and "1" in all tinyxml2 variants.

encfs/FileUtils.cpp

@@ -536,12 +536,12 @@ bool writeV6Config(const char *configFile, const EncFSConfig *cfg) {
   addEl(doc, config, "nameAlg", cfg->nameIface);
   addEl(doc, config, "keySize", cfg->keySize);
   addEl(doc, config, "blockSize", cfg->blockSize);
-  addEl(doc, config, "uniqueIV", cfg->uniqueIV);
-  addEl(doc, config, "chainedNameIV", cfg->chainedNameIV);
-  addEl(doc, config, "externalIVChaining", cfg->externalIVChaining);
+  addEl(doc, config, "uniqueIV", (int)cfg->uniqueIV);
+  addEl(doc, config, "chainedNameIV", (int)cfg->chainedNameIV);
+  addEl(doc, config, "externalIVChaining", (int)cfg->externalIVChaining);
   addEl(doc, config, "blockMACBytes", cfg->blockMACBytes);
   addEl(doc, config, "blockMACRandBytes", cfg->blockMACRandBytes);
-  addEl(doc, config, "allowHoles", cfg->allowHoles);
+  addEl(doc, config, "allowHoles", (int)cfg->allowHoles);
   addEl(doc, config, "encodedKeySize", (int)cfg->keyData.size());
   addEl(doc, config, "encodedKeyData", cfg->keyData);
   addEl(doc, config, "saltLen", (int)cfg->salt.size());