build-sys: Use automake 'subdir-objects' options
build-sys: Use automake 'subdir-objects' options

c_binding/Makefile.am references some files from the util/ subdirectory.
This causes warning with newer automakes unless 'subdir-objects' is
used:

c_binding/Makefile.am:12: warning: source file 'util/qparams.c' is in a subdirectory,
c_binding/Makefile.am:12: but option 'subdir-objects' is disabled
automake: warning: possible forward-incompatibility.
automake: At least a source file is in a subdirectory, but the 'subdir-objects'
automake: automake option hasn't been enabled.  For now, the corresponding output
automake: object file(s) will be placed in the top-level directory.  However,
automake: this behaviour will change in future Automake versions: they will
automake: unconditionally cause object files to be placed in the same subdirectory
automake: of the corresponding sources.
automake: You are advised to start using 'subdir-objects' option throughout your
automake: project, to avoid future incompatibilities.

libstorage/libstoragemgmt,libstorage/libstoragemgmt,cathay4t/libstoragemgmt,lazy404/libstoragemgmt,HP-Scale-out-Storage/libstoragemgmt,jumitche/libstoragemgmt,tasleson/libstoragemgmt,cathay4t/libstoragemgmt,cathay4t/libstoragemgmt,joehandzik/libstoragemgmt,libstorage/libstoragemgmt,cathay4t/libstoragemgmt,jumitche/libstoragemgmt,lazy404/libstoragemgmt,tasleson/libstoragemgmt,libstorage/libstoragemgmt,tasleson/libstoragemgmt,HP-Scale-out-Storage/libstoragemgmt,jumitche/libstoragemgmt,joehandzik/libstoragemgmt,tasleson/libstoragemgmt,cathay4t/libstoragemgmt,jumitche/libstoragemgmt,tasleson/libstoragemgmt,libstorage/libstoragemgmt,lazy404/libstoragemgmt,HP-Scale-out-Storage/libstoragemgmt,jumitche/libstoragemgmt,HP-Scale-out-Storage/libstoragemgmt,joehandzik/libstoragemgmt,joehandzik/libstoragemgmt,lazy404/libstoragemgmt