further suppress generation of info docs

with latest gcc, info files were appearing in the top-level install
directory. this seems to make them go away again.

litecross/Makefile

@@ -43,6 +43,7 @@ endif
 MAKE += MULTILIB_OSDIRNAMES=
 MAKE += INFO_DEPS= infodir=
 MAKE += ac_cv_prog_lex_root=lex.yy.c
+MAKE += MAKEINFO=false
 
 FULL_TOOLCHAIN_CONFIG = --enable-languages=c,c++ \
 	$(GCC_CONFIG_FOR_TARGET) \