Install the pman library and its header.
Upstream status: https://github.com/falcosecurity/libs/pull/1842

diff --git a/userspace/libpman/CMakeLists.txt b/userspace/libpman/CMakeLists.txt
index da92e9f27..4b57365fe 100644
--- a/userspace/libpman/CMakeLists.txt
+++ b/userspace/libpman/CMakeLists.txt
@@ -58,3 +58,6 @@ endif()
 if(USE_BUNDLED_LIBBPF)
     add_dependencies(pman libbpf)
 endif()
+
+install(TARGETS pman LIBRARY ARCHIVE FRAMEWORK)
+install(FILES include/libpman.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})