sh: Don't export __{s,u}divsi3_i4i from SH-2 libgcc.

rsk7203_defconfig fails to build with the following error:

<--  snip  -->

...
  LD      .tmp_vmlinux1
arch/sh/kernel/built-in.o:(__ksymtab+0xb8): undefined reference to `__udivsi3_i4i'
arch/sh/kernel/built-in.o:(__ksymtab+0xc8): undefined reference to `__sdivsi3_i4i'
make[1]: *** [.tmp_vmlinux1] Error 1

<--  snip  -->

That worked with 2.6.26, and these are far less undefined references
than in the cases where libgcc was missing.

[ These symbols are not defined on SH-2 versions of libgcc, so we have to
  special case the export there. - Paul ]
Reported-by: NAdrian Bunk <bunk@kernel.org>
Signed-off-by: NYoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/kernel/sh_ksyms_32.c

@@ -107,10 +107,12 @@ DECLARE_EXPORT(__movmemSI12_i4);
  * GCC >= 4.2 emits these for division, as do GCC 4.1.x versions of the ST
  * compiler which include backported patches.
  */
-DECLARE_EXPORT(__sdivsi3_i4i);
 DECLARE_EXPORT(__udiv_qrnnd_16);
+#if !defined(CONFIG_CPU_SH2)
+DECLARE_EXPORT(__sdivsi3_i4i);
 DECLARE_EXPORT(__udivsi3_i4i);
 #endif
+#endif
 #else /* GCC 3.x */
 DECLARE_EXPORT(__movstr_i4_even);
 DECLARE_EXPORT(__movstr_i4_odd);