xfsprogs: depends on MMU

Fixes http://sysmic.org/~jezz/results/17f32103:

xfs_fsr.o: In function `fsrallfs':
/home/jezz/br-continuous/cfgs/45-bf609-bfin-uclibc-nommu-ext/build/xfsprogs-3.1.11/fsr/xfs_fsr.c:617: undefined reference to `_fork'
collect2: ld returned 1 exit status

madvise.o: In function `madvise_f':
/home/jezz/br-continuous/cfgs/45-bf609-bfin-uclibc-nommu-ext/build/xfsprogs-3.1.11/io/madvise.c:111: undefined reference to `_madvise'
mincore.o: In function `mincore_f':
/home/jezz/br-continuous/cfgs/45-bf609-bfin-uclibc-nommu-ext/build/xfsprogs-3.1.11/io/mincore.c:77: undefined reference to `_mincore'
collect2: ld returned 1 exit status

[Peter: don't mention mmu dependency in comment]
Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/xfsprogs/Config.in

@@ -3,10 +3,12 @@ comment "Note that xfsprogs needs a toolchain with UCLIBC_SV4_DEPRECATED and UCL
 	depends on BR2_PACKAGE_XFSPROGS
 
 comment "xfsprogs needs a toolchain w/ largefile, wchar"
+	depends on BR2_USE_MMU
 	depends on !(BR2_LARGEFILE && BR2_USE_WCHAR)
 
 config BR2_PACKAGE_XFSPROGS
 	bool "xfsprogs"
+	depends on BR2_USE_MMU # fork()
 	depends on BR2_LARGEFILE
 	depends on BR2_USE_WCHAR # util-linux
 	select BR2_PACKAGE_UTIL_LINUX