* configure.ac: Check for `__ashldi3', `__ashrdi3', `__lshrdi3',
`__trampoline_setup' and `__ucmpdi2'.
* include/grub/powerpc/libgcc.h: Only export symbols for functions
that libgcc provides.
* configure.ac: Check for `__ashldi3', `__ashrdi3', `__lshrdi3',
`__trampoline_setup' and `__ucmpdi2'.
* include/grub/powerpc/libgcc.h: Only export symbols for functions
that libgcc provides.