Build failure on ppc64le

[Paul Menzel <paulepanter@users.sourceforge.net>]

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Dear GRUB folks,


Building GRUB at commit 7346682 (Allow GRUB to mount ext2/3/4
filesystems that have the encryption feature.) for the platform
`powerpc-ieee1275` with Ubuntu 16.04.02 LTS (Xenial Xerus) on such a
machine (ppc64le), fails with the error below.

```
$ ./autogen.sh
$ ./configure
$ make
[…]
gcc -Os -Wall -W -Wshadow -Wpointer-arith -Wundef -Wchar-subscripts -Wcomment -Wdeprecated-declarations -Wdisabled-optimization -Wdiv-by-zero -Wfloat-equal -Wformat-extra-args -Wformat-security -Wformat-y2k -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Wmain -Wmissing-braces -Wmissing-format-attribute -Wmultichar -Wparentheses -Wreturn-type -Wsequence-point -Wshadow -Wsign-compare -Wswitch -Wtrigraphs -Wunknown-pragmas -Wunused -Wunused-function -Wunused-label -Wunused-parameter -Wunused-value  -Wunused-variable -Wwrite-strings -Wnested-externs -Wstrict-prototypes -g -Wredundant-decls -Wmissing-prototypes -Wmissing-declarations -Wcast-align  -Wextra -Wattributes -Wendif-labels -Winit-self -Wint-to-pointer-cast -Winvalid-pch -Wmissing-field-initializers -Wnonnull -Woverflow -Wvla -Wpointer-to-int-cast -Wstrict-aliasing -Wvariadic-macros -Wvolatile-register-var -Wpointer-sign -Wmissing-include-dirs -Wmissing-prototypes -Wmissing-declarations -Wformat=2 -mbig-endian -m32 -freg-struct-return -msoft-float -fno-dwarf2-cfi-asm -fno-asynchronous-unwind-tables -fno-unwind-tables -Qn -fno-stack-protector -Wtrampolines -Werror  -mcpu=powerpc -ffreestanding   -mbig-endian -m32 -Wl,--build-id=none  -nostdlib -Wl,-N -Wl,-Ttext,0x200000   -o kernel.exec kern/powerpc/ieee1275/kernel_exec-startup.o kern/powerpc/kernel_exec-cache.o kern/powerpc/kernel_exec-dl.o kern/powerpc/kernel_exec-compiler-rt.o disk/ieee1275/kernel_exec-ofdisk.o kern/ieee1275/kernel_exec-cmain.o kern/ieee1275/kernel_exec-ieee1275.o kern/ieee1275/kernel_exec-mmap.o kern/ieee1275/kernel_exec-openfw.o term/ieee1275/kernel_exec-console.o kern/ieee1275/kernel_exec-init.o term/kernel_exec-terminfo.o term/kernel_exec-tparm.o commands/kernel_exec-extcmd.o lib/kernel_exec-arg.o kern/kernel_exec-compiler-rt.o kern/kernel_exec-mm.o kern/kernel_exec-time.o kern/generic/kernel_exec-millisleep.o kern/kernel_exec-command.o kern/kernel_exec-corecmd.o kern/kernel_exec-device.o kern/kernel_exec-disk.o kern/kernel_exec-dl.o kern/kernel_exec-env.o kern/kernel_exec-err.o kern/kernel_exec-file.o kern/kernel_exec-fs.o kern/kernel_exec-list.o kern/kernel_exec-main.o kern/kernel_exec-misc.o kern/kernel_exec-parser.o kern/kernel_exec-partition.o kern/kernel_exec-rescue_parser.o kern/kernel_exec-rescue_reader.o kern/kernel_exec-term.o kernel_exec-symlist.o
kernel_exec-symlist.o:(.data+0x214): undefined reference to `grub_arch_sync_dma_caches'
collect2: error: ld returned 1 exit status
[…]
```


Thanks,

Paul

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