#73 jmp_buf declared wrongly

I came across two problems:

1. stdlib.h and string.h that come with prc-tools libc
both declare functions strtol and strtoul. According to
the C standard it should be only in stdlib.h. What's
worse, they have different prototypes and the compiler
complains if both headers are included.

2. In setjmp.h the jmp_buf is incorrectly typedef'd as
jmpbuf. Moreover, jmp_buf should not be a pointer
declaration; the functions should take a jmp_buf[1]
parameter instead.

[John Marshall]

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The strtol/strtoul problems were fixed in CVS yesterday.

I knew about the jmp_buf problems, but thanks for filing a
bug about them so that they don't get forgotten.

In general, these are yet more examples of "the (old) tiny
libc is horribly broken". Thanks.