bison: avoid a parallel build problem in src/yacc
bison: avoid a parallel build problem in src/yacc

Sometimes the following problem occurs while parallel make
builds bison-native. It seems to depend on condition of
build processes running parallelly.

/bin/bash: src/yacc.tmp: No such file or directory
Makefile:5699: recipe for target 'src/yacc' failed
make[2]: *** [src/yacc] Error 1

Signed-off-by: HAYASHI Kazuhiro <d6ab13038406a238a56011921c4eda80a48396fd@toshiba.co.jp>

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