Add a tracing framework.
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Description

Add a tracing framework.

* src/init.c (trace_save_errno, trace_arg_module)
(trace_arg_file, trace_arg_line): New module vars.
(do_internal_trace): New.
(_gpgrt_internal_trace_printf): New.
(_gpgrt_internal_trace): New.
(_gpgrt_internal_trace_errno): New.
(_gpgrt_internal_trace_end): New.
* src/gpgrt-int.h (trace): New macro.
(trace_errno): New macro.
(trace_start): New macro.
(trace_append): New macro.
(trace_finish): New macro.

We want to be abale to use libgpg-error also with pre-c99 compilers
and thus we can use the VA_ARGS but resort to the common macro
trick.