devel/creduce: fix build on powerpc

libtool: link: /usr/local/bin/clang80 -O2 -pipe -fstack-protector-strong -fno-strict-aliasing -fstack-protector-strong -o unifdef unifdef-unifdef.o
ld: error: unifdef.c:(function main: .text+0x1C2): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function main: .text+0x33A): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function main: .text+0x3C2): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function main: .text+0x422): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function main: .text+0x4EE): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function main: .text+0x81A): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function main: .text+0x8B2): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function main: .text+0x94A): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function process: .text+0x187A): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function process: .text+0x1912): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function process: .text+0x1A0E): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function process: .text+0x1A9E): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function process: .text+0x1B16): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function process: .text+0x1B7E): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function process: .text+0x1D72): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function skipcomment: .text+0x226A): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function findsym: .text+0x265A): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function findsym: .text+0x275A): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function eval_unary: .text+0x34D2): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: unifdef.c:(function eval_unary: .text+0x356E): unknown relocation (88) against symbol _ThreadRuneLocale
ld: error: too many errors emitted, stopping now (use -error-limit=0 to see all errors)