19981012, another sparc solaris bootstrap failure

[Stephen L Moshier]

Building on sparc-sun-solaris2.5 stopped here due to a missing
header file.  Actually it looks like the file shouldn't be needed
since the reference to it supposedly is conditional on GLIBC.

------------
gmake bootstrap
...
gmake[2]: *** No rule to make target `libc-lock.h', needed by
`filedoalloc.o'. \
 Stop.
gmake[2]: Leaving directory
`~/solaris/sparc-sun-solaris2.5/li\
bio'
gmake[1]: *** [all-target-libio] Error 2
------------