Remove useless file.

It is already in the cmake subfolder.

sot-dyninv.pc.cmake

-prefix=${CMAKE_INSTALL_PREFIX}
-exec_prefix=${install_pkg_prefix}
-libdir=${install_pkg_exec_prefix}/lib/plugin
-includedir=${install_pkg_prefix}/include
-datarootdir=${install_pkg_prefix}/share
-docdir=${install_pkg_datarootdir}/doc/${PROJECT_NAME}
-
-Name: ${PROJECT_NAME}
-Description:
-Version: ${PROJECT_VERSION}
-Requires: ${PACKAGE_REQUIREMENTS}
-Libs: ${LIBDIR_KW}${install_pkg_libdir} ${${PROJECT_NAME}_LDFLAGS}
-Cflags: -I${install_pkg_include_dir} ${${PROJECT_NAME}_CXXFLAGS}