Convert `libcap_1.10` to new staging system by removing `do_stage()` [1].

Convert `libcap_1.10` to new staging system by removing `do_stage()` [1].

This change is build tested with the following configuration and `PREFERRED_BINUTILS_VERSION = "2.21"`.

        Build Configuration:
        BB_VERSION        = "1.10.2"
        METADATA_BRANCH   = "org.openembedded.dev"
        METADATA_REVISION = "224c193"
        TARGET_ARCH       = "arm"
        TARGET_OS         = "linux-uclibceabi"
        MACHINE           = "beagleboard"
        DISTRO            = "minimal-uclibc"
        DISTRO_VERSION    = "dev-snapshot-20110109"
        TARGET_FPU        = "soft"

[1] http://wiki.openembedded.org/index.php/Legacy_staging

Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Signed-off-by: Khem Raj <raj.khem@gmail.com>