libfprint/build: Ignore LD_LIBRARY_PATH (and use rpath) on local binaries

DT_RUNPATH is intentionally searched after $LD_LIBRARY_PATH.
-Wl,--disable-new-dtags switches to the old DT_RPATH tag, which is searched
before $LD_LIBRARY_PATH. So the embedded paths in the build binary will now
win over whatever is in the environment.

Not breaking builds.

libfprint/meson.build

@@ -329,7 +329,9 @@ udev_hwdb = executable('fprint-list-udev-hwdb',
     'fprint-list-udev-hwdb.c',
     dependencies: libfprint_private_dep,
     link_with: libfprint_drivers,
-    install: false)
+    install: false,
+    link_args: ['-Wl,--disable-new-dtags'],
+)
 
 udev_hwdb_generator = custom_target('udev-hwdb',
     output: 'autosuspend.hwdb',
@@ -343,7 +345,9 @@ metainfo = executable('fprint-list-metainfo',
     'fprint-list-metainfo.c',
     dependencies: libfprint_private_dep,
     link_with: libfprint_drivers,
-    install: false)
+    install: false,
+    link_args: ['-Wl,--disable-new-dtags'],
+)
 
 metainfo_generator = custom_target('metainfo',
     output: 'org.freedesktop.libfprint.metainfo.xml',
@@ -359,7 +363,9 @@ if install_udev_rules
         'fprint-list-udev-rules.c',
         dependencies: libfprint_private_dep,
         link_with: libfprint_drivers,
-        install: false)
+        install: false,
+        link_args: ['-Wl,--disable-new-dtags'],
+    )
 
     custom_target('udev-rules',
         output: '70-@0@.rules'.format(versioned_libname),