compat_defs.h / u_longlong_t

[Jason Thorpe <thorpej%me.com@localhost>]

----------------------------
revision 1.110
date: 2018-06-11 18:48:24 +0000;  author: maya;  state: Exp;  lines: +5 -1;  com
mitid: sW02GrA6eU9awTFA;
Add configure check and fallback definition for u_longlong_t

Should help linux tools compilation of dtrace tools, and not
affect NetBSD.

From Chuck Zmudzinski in current-users, with light modification
by myself.
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This revision causes the following problem bootstrapping the tools on macOS:

#   compile  compat/atoll.lo
cc -O   -no-cpp-precomp -I. -I./include -I/Users/thorpej/NetBSD/current/src/tools/compat -I/Users/thorpej/NetBSD/current/src/tools/compat/sys  -DHAVE_NBTOOL_CONFIG_H=1 -D_FILE_OFFSET_BITS=64 -D__DBINTERFACE_PRIVATE -c -o atoll.lo.o    /Users/thorpej/NetBSD/current/src/tools/compat/../../lib/libc/stdlib/atoll.c
In file included from /Users/thorpej/NetBSD/current/src/tools/compat/../../lib/libc/stdlib/atoll.c:33:
In file included from ./nbtool_config.h:885:
/Users/thorpej/NetBSD/current/src/tools/compat/compat_defs.h:72:9: error: 
      unknown type name 'uint64_t'
typedef uint64_t u_longlong_t;

The standard header that defines ‘uint64_t’ is <stdint.h>, but that isn’t bring brought into scope in this case.

Are we trying to protect against compilers that don’t grok “unsigned long long”?

-- thorpej