powerpc and powerpc64 builds broken

Both powerpc and powerpc64 builds are broken in the same way, in
usr.bin/mkesdb.  It was working correctly as of just before BSDCan, I
successfully built world and kernel on June 6.

The error seen at this point is:

cc  -O2 -pipe   -I/home/chmeee/freebsd/head/usr.bin/mkesdb
-I/home/chmeee/freebsd/head/usr.bin/mkesdb/../mkesdb
-I/home/chmeee/freebsd/head/usr.bin/mkesdb/../../lib/libc/iconv
-std=gnu99 -fstack-protector -Wsystem-headers -Werror -Wall
-Wno-format-y2k -W -Wno-unused-parameter -Wstrict-prototypes
-Wmissing-prototypes -Wpointer-arith -Wreturn-type -Wcast-qual
-Wwrite-strings -Wswitch -Wshadow -Wunused-parameter -Wcast-align
-Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls
-Wold-style-definition -Wno-pointer-sign
-L/home/chmeee/world/zhabar/home/chmeee/freebsd/head/usr.bin/mkesdb/../../lib/libc
-o mkesdb lex.o yacc.o
/home/chmeee/world/zhabar/home/chmeee/freebsd/head/tmp/usr/bin/ld:
undefined reference to symbol `_end' (try adding -lc)
/home/chmeee/world/zhabar/home/chmeee/freebsd/head/tmp/lib/libc.so.7:
could not read symbols: Bad value

I've seen this both locally on my G5, and on the Power8 in the FreeBSD cluster.

- Justin