Do not rely on libtextencoding for conversions.

It create two types of problems:
- If the translator is not linked with libtextencoding, it can't be used
  in apps that don't link with it
- If the translator is linked with libtextencoding, it deadlocks apps
  that don't link with it

Since the conversion from ISO 8859 to UTF8 is simple enough, implement
it manually.
diff --git a/AmigaCatalog.cpp b/AmigaCatalog.cpp
index 9633b89..33defbe 100644
--- a/AmigaCatalog.cpp
+++ b/AmigaCatalog.cpp
@@ -202,8 +202,8 @@
 						strLen &= ~3;
 						strLen += 4;
 					}
-					char strBase[strLen];
-					char* strVal = strBase;
+					unsigned char strBase[strLen];
+					unsigned char* strVal = strBase;
 					strings.Read(strBase, strLen);
 
 					if (strBase[1] == 0)
@@ -213,19 +213,19 @@
 						strVal += 2;
 					}
 
-					char outVal[1024];
-					int32 outLen = 1024;
-					int32 cookie = 0;
+					unsigned char outVal[1024];
 
-					convert_to_utf8(B_ISO1_CONVERSION, strVal, &strLen,
-						outVal, &outLen, &cookie);
+					int j = 0;
+					for (int i = 0; i < strLen && j < 1024; i++) {
+						if (strVal[i] > 0x7F) {
+							outVal[j++] = 0xC0 | ((strVal[i] >> 6) & 0x3);
+							outVal[j++] = 0x80 | (strVal[i] & 0x3f);
+						} else
+							outVal[j++] = strVal[i];
+					}
+					outVal[j] = 0;
 
-					// If the UTF-8 version is shorter, it's likely that
-					// something went wrong. Keep the original string.
-					if (outLen > strLen)
-						SetString(strID, outVal);
-					else
-						SetString(strID, strVal);
+					SetString(strID, (char*)outVal);
 				}
 				break;
 			}