libtool related compile issue on msys2

[Torsten Kühnel]

Hi, i encountered 2 similar errors in an attempt to build check-0.14.0
and popt-1.16 on latest msys2.

...
./.libs/lt-ex_output.c: In function 'main':
./.libs/lt-ex_output.c:319:16: warning: implicit declaration of function 
'_spawnv'; did you mean 'spawnv'? [-Wimplicit-function-declaration]
  319 |   rval = (int) _spawnv (_P_WAIT, lt_argv_zero, (const char * const *) 
newargz);
      |                ^~~~~~~
      |                spawnv

A bit more detailed on https://pastebin.com/VKnYxXXm

For libcheck the problem can be solved by using cmake to build it. But
autotools/automake build system should work, too, as long as it is supported.

What i hope will be until the end of the universe :)

Configuring with any CFLAGS=-D_XOPEN_SOURCE=500 or such did not solve the 
problem.
Any help apreciated.
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