Fix for this error:

/cross/crosstool-0.27/build/sparc64-unknown-linux-gnu/gcc-3.3.3-glibc-2.3.2/build-glibc/libc_pic.os(.text+0xc4d28): In function `posix_fallocate64':
: undefined reference to `__GI___pwrite64'
collect2: ld returned 1 exit status
make[1]: *** [/cross/crosstool-0.27/build/sparc64-unknown-linux-gnu/gcc-3.3.3-glibc-2.3.2/build-glibc/libc.so] Error 1

extracted from GLIBC CVS by M.H.VanLeeuwen

cf. 
http://sources.redhat.com/ml/libc-alpha/2003-10/msg00038.html

Originally thought we needed this hunk, too:
http://sources.redhat.com/ml/libc-alpha/2003-10/msg00037.html
but it seems the sysdep.h change is sufficient, and works better 
when compiling against linux-2.4.

--- glibc-2.3.2/sysdeps/unix/sysv/linux/sparc/sparc64/sysdep.h.orig	Sat Mar 13 02:01:51 2004
+++ glibc-2.3.2/sysdeps/unix/sysv/linux/sparc/sparc64/sysdep.h	Sat Mar 13 02:02:20 2004
@@ -29,6 +29,16 @@
 #undef SYS_ify
 #define SYS_ify(syscall_name) __NR_##syscall_name
 
+/* This is a kludge to make syscalls.list find these under the names
+   pread and pwrite, since some kernel headers define those names
+   and some define the *64 names for the same system calls.  */
+#if !defined __NR_pread && defined __NR_pread64
+# define __NR_pread __NR_pread64
+#endif
+#if !defined __NR_pwrite && defined __NR_pwrite64
+# define __NR_pwrite __NR_pwrite64
+#endif
+
 #ifdef __ASSEMBLER__
 
 #define LOADSYSCALL(x) mov __NR_##x, %g1