OpenBSD doesnt have librt

make sure rpath is set in the resulting binary for libinotify.so

Index: meson.build
--- meson.build.orig
+++ meson.build
@@ -40,7 +40,7 @@ xkb = dependency('xkbcommon')
 fontconfig = dependency('fontconfig')
 freetype = dependency('freetype2')
 threads = dependency('threads')
-rt = cc.find_library('rt')
+# rt = cc.find_library('rt')
 m = cc.find_library('m')
 
 # wayland support
@@ -333,7 +333,7 @@ executable(
     dependencies: [
         # runtime
         m,
-        rt,
+        # rt,
         threads,
         wlcln,
         epoll,
@@ -359,5 +359,6 @@ executable(
         webp,
         webp_demux,
     ],
+    install_rpath : '/usr/local/lib/inotify',
     install: true,
 )
