try linking against execinfo when execinfo.h is present

This should fix build on systems where execinfo.h is present
but the APIs are implemented in a separate library - commonly
a case on the BSDs as well as on non-glibc libcs and so on.

meson.build

@@ -184,6 +184,9 @@ if cc.has_header('netinet/in.h') == true
 endif
 if cc.has_header('execinfo.h') == true
   config_h.set('HAVE_EXECINFO_H'       , '1')
+  dep_execinfo = cc.find_library('execinfo', required: false)
+else
+  dep_execinfo = dependency('', required: false)
 endif
 if cc.has_function('explicit_bzero') == true
   config_h.set('HAVE_EXPLICIT_BZERO'   , '1')

src/bin/meson.build

@@ -15,6 +15,7 @@ deps_e = [
   dep_rt,
   dep_m,
   dep_dl,
+  dep_execinfo,
   dep_eina,
   dep_eet,
   dep_eeze,