In-house patch for firefox to build with GNU compilers. 

With GNU compiler, we have hunspell_fopen_hooks.h included 

through mozilla-config.h.

But we don't have an implementation for mozilla::ReadAheadFile().

Do not plan to send upstream.

diff --git a/xpcom/glue/FileUtils.cpp b/xpcom/glue/FileUtils.cpp

--- a/xpcom/glue/FileUtils.cpp

+++ b/xpcom/glue/FileUtils.cpp

@@ -481,17 +481,17 @@ mozilla::ReadAheadFile(mozilla::pathstr_

   }

   if (fd == INVALID_HANDLE_VALUE) {

     return;

   }

   ReadAhead(fd, aOffset, aCount);

   if (!aOutFd) {

     CloseHandle(fd);

   }

-#elif defined(LINUX) && !defined(ANDROID) || defined(XP_MACOSX)

+#elif defined(LINUX) && !defined(ANDROID) || defined(XP_MACOSX) || defined(SOLARIS)

   if (!aFilePath) {

     if (aOutFd) {

       *aOutFd = -1;

     }

     return;

   }

   int fd = open(aFilePath, O_RDONLY);

   if (aOutFd) {