libhugetlbfs: update srcrev to 2.18 release

* Update recipe:
  - update SRCREV to latest release, 2.18
  - switch back to master branch
  - increase verbosity (pass V=1 to EXTRA_OEMAKE) to make debugging easier
* Drop patches:
  - fix-lib64-can-not-be-shiped-in-64bit-target.patch
    replaced by LIBARGS definition. the build system allows to override libdir
    using LIB32 and LIB64 variables
  - 0001-install-perl-lib-to-directory-perl-instead-of-perl5.patch
    replaced by a one-liner to fixup perl module directory hardcoded to perl5
* Refresh skip-checking-LIB32-and-LIB64-if-they-point-to-the-s.patch
  - only disable the error to skip the check
* Add patches:
  - 0001-aarch64-fix-cross-compilation.patch - submitted upstream
    allow to override CC and use it for aarch64 case like the other arch
  - 0001-aarch64-fix-page-size-not-properly-computed.patch - submitted upstream
    fix typo on MB variable (MB -> $MB) and add the missing linker variants
    (aarch64elfb, aarch64linux, aarch64linuxb)
  - 0001-replace-lib-lib64-hardcoded-values-by-LIBDIR32-LIBDI.patch
    submitted upstream. replace lib/lib64 hardcoded values by LIBDIR32 and
    LIBDIR64 variables
* Remove patches that aren't applied in the recipe (they're all merged
  upstream and available in 2.18 release):
  - libhugetlbfs/files/aarch64-support.patch
  - aarch64-unit-test-fixes.patch
  - add-PROT-NONE-to-the-mprotest-test.patch

Signed-off-by: Fathi Boudra <fathi.boudra@linaro.org>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>