fontconfig: Only remove ${STAGING_DIR_HOST} in *.pc file of recipe target
fontconfig: Only remove ${STAGING_DIR_HOST} in *.pc file of recipe target

When build native, ${STAGING_DIR_HOST} become empty and make sed error:
  | sed: -e expression #1, char 0: no previous regular expression
No need to remove it on recipe native.

Signed-off-by: Trung Do <64081e6b7eb2b24289b8a4e51cef9836ddf28af2@toshiba-tsdv.com>

meta-debian/meta-debian,tienlee/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,tienlee/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,tienlee/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,meta-debian/meta-debian