Fix broken file name in install command in SWIG Perl bindings
Fix broken file name in install command in SWIG Perl bindings

A correct file name should be openscap_pm.pm, according to
the target name. Addressing:
CMake Error at swig/perl/cmake_install.cmake:61 (file):
  file INSTALL cannot find
  "/home/jcerny/openscap/build/swig/perl/openscap.pm".
Call Stack (most recent call first):
  swig/cmake_install.cmake:42 (include)
  cmake_install.cmake:54 (include)

redhatrises/openscap,OpenSCAP/openscap,jan-cerny/openscap,jan-cerny/openscap,redhatrises/openscap,jan-cerny/openscap,mpreisler/openscap,redhatrises/openscap,mpreisler/openscap,OpenSCAP/openscap,mpreisler/openscap,jan-cerny/openscap,redhatrises/openscap,redhatrises/openscap,mpreisler/openscap,OpenSCAP/openscap,mpreisler/openscap,mpreisler/openscap,OpenSCAP/openscap,OpenSCAP/openscap,jan-cerny/openscap,OpenSCAP/openscap,jan-cerny/openscap,redhatrises/openscap