Fixes for bugs in the usage of IO_CACHE

BUILD/compile-alpha-cxx

+/bin/rm -f */.deps/*.P */*.o
+make -k clean
+/bin/rm -f */.deps/*.P */*.o
+/bin/rm -f config.cache mysql-*.tar.gz
+aclocal; autoheader; aclocal; automake; autoconf
+
+CC=ccc CFLAGS="-fast" CXX=cxx CXXFLAGS="-fast -noexceptions -nortti" ./configure --prefix=/usr/local/mysql --disable-shared --with-extra-charsets=complex --enable-thread-safe-client --with-mysqld-ldflags=-all-static
+make
+rm */.deps/*
+make
+if [ $? = 0 ]
+then
+  rm */.deps/*
+  bin/mysqladmin shutdown
+  sur make install
+  if [ $? = 0 ]
+  then
+     scripts/make_binary_distribution
+  fi
+fi
+
+exit
+
+# This should give better performance by compiling many files at once, but
+# according to our benchmarks there isn't any real difference.
+
+pwd=`pwd`
+for i in */make-ccc
+do
+   cd `dirname $i`
+   make-ccc
+   cd $pwd
+done
+cd sql
+rm mysqld .deps/*.P
+make mysqld
+cd $pwd