slapos/obs: Overwrite environment for openssl to include PERL5LIB

  As PERL5LIB is defined based on destdir, the perl binaries during the build are unusable without it.

component/slapos/obs.cfg

@@ -72,6 +72,10 @@ prefix = ${buildout:rootdir}/parts/${:_buildout_section_name_}
 location = ${buildout:parts-directory}/${:_buildout_section_name_}
 make-options +=
   INSTALL_PREFIX=${buildout:destdir}
+ 
+environment =
+  PERL5LIB=${perl:location}/lib/5.26.1/
+  PERL=${perl:location}/bin/perl
 
 [bison-go]
 <= bison