[patch/libdecnumber] Fix to compile with Solaris make

[Thiago Jung Bauermann]

Hi folks,

My previous patch to the libdecnumber build system enabled libdecnumber
to be built by native make on *BSD, but Solaris' make still doens't
work.

The problem is that in that version of make, the $< automatic variable
is not set for targets that have an explicit compilation rule instead of
using the .c.o default rule.

This patch substitutes the $< variable for the explicit name of the
source file which should be compiled in those targets that define a
compilation rule.

It also prepends $(srcdir) to the path of files that reside in a
subdirectory of the libdecnumber source tree, for completeness.

I tested by compiling libdecnumber on Solaris, Linux and OpenBSD.

Is this ok?
-- 
[]'s
Thiago Jung Bauermann
Software Engineer
IBM Linux Technology Center
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