can't build ~/stable/10 without XEN

[Volodymyr Kostyrko]

Hi all.

If 'device xenpci' is removed from kernel config kernel compilation fails:

cd /usr/obj/usr/src/sys/MINIMAL; MAKEOBJDIRPREFIX=/usr/obj 
MACHINE_ARCH=amd64  MACHINE=amd64  CPUTYPE=native 
GROFF_BIN_PATH=/usr/obj/usr/src/tmp/legacy/usr/bin 
GROFF_FONT_PATH=/usr/obj/usr/src/tmp/legacy/usr/share/groff_font 
GROFF_TMAC_PATH=/usr/obj/usr/src/tmp/legacy/usr/share/tmac 
_SHLIBDIRPREFIX=/usr/obj/usr/src/tmp  _LDSCRIPTROOT=  VERSION="FreeBSD 
10.0-STABLE amd64 1000704"  INSTALL="sh /usr/src/tools/install.sh" 
PATH=/usr/obj/usr/src/tmp/legacy/usr/sbin:/usr/obj/usr/src/tmp/legacy/usr/bin:/usr/obj/usr/src/tmp/legacy/usr/games:/usr/obj/usr/src/tmp/legacy/bin:/usr/obj/usr/src/tmp/usr/sbin:/usr/obj/usr/src/tmp/usr/bin:/usr/obj/usr/src/tmp/usr/games:/sbin:/bin:/usr/sbin:/usr/bin 
CC="cc " CXX="c++ "  CPP="cpp "  AS="as" AR="ar" LD="ld" NM=nm  OBJDUMP= 
RANLIB=ranlib STRINGS= COMPILER_TYPE=clang make  -m /usr/src/share/mk 
KERNEL=kernel all -DNO_MODULES_OBJ
linking kernel.debug
gnttab.o: In function `gnttab_resume':
/usr/src/sys/xen/gnttab.c:617: undefined reference to `xenpci_alloc_space'
*** Error code 1

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Sphinx of black quartz, judge my vow.