libzfsbootenv: do not depend on libnvpair

We do not build libnvpair.pc.  Moreover, it is automatically pulled in
by libzfs.pc, so no additional specific dependency is required.

Reviewed by: Toomas Soome <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Antonio Russo <[email protected]>
Closes #11227

Author: aerusso

lib/libzfsbootenv/libzfsbootenv.pc.in

@@ -7,6 +7,6 @@ Name: libzfsbootenv
 Description: LibZFSBootENV library
 Version: @VERSION@
 URL: https://github.com/openzfs/zfs
-Requires: libzfs libnvpair
+Requires: libzfs
 Cflags: -I${includedir}
 Libs: -L${libdir} -lzfsbootenv