gcc 4 Thunderbird fixes for Mac OS X. Patch by Mark Mentovai. b=297619 r=peterv r=josh sr=peterv a=dbaron

mailnews/compose/src/nsMsgAppleDouble.h

@@ -218,7 +218,7 @@ typedef struct _appledouble_decode_object
 PR_BEGIN_EXTERN_C
 
 int ap_encode_init(appledouble_encode_object *p_ap_encode_obj, 
-					char* fname,
+					const char* fname,
 					char* separator);
 
 int ap_encode_next(appledouble_encode_object* p_ap_encode_obj, 

mailnews/compose/src/nsMsgAppleDoubleEncode.cpp

@@ -134,7 +134,7 @@ MacGetFileType(nsFileSpec   *fs,
 */
 
 int ap_encode_init( appledouble_encode_object *p_ap_encode_obj,
-	                  char                      *fname,
+                    const char                *fname,
                     char                      *separator)
 {
 	FSSpec	fspec;
@@ -146,7 +146,7 @@ int ap_encode_init( appledouble_encode_object *p_ap_encode_obj,
 #if defined(XP_MAC)
 	fspec = mySpec.GetFSSpec();
 #else
-	FSPathMakeFSSpec((UInt8 *)fname, &fspec, NULL);
+	FSPathMakeFSSpec((const UInt8 *)fname, &fspec, NULL);
 #endif
 	memset(p_ap_encode_obj, 0, sizeof(appledouble_encode_object));