libmusicbrainz: add dependency on neon-native

* we're building separate native binary make-c-interface which is also checking
  for neon with pkg-config, when it fails it's not fatal and configure continues
  to configure target version (which finds neon correctly) but failed native
  make-c-interface build resultsin this error:

  -- Found PkgConfig: /OE/build/oe-core/tmp-eglibc/sysroots/x86_64-linux/usr/bin/pkg-config (found version "0.28")
  -- checking for module 'neon'
  --   found neon, version 0.30.0
  CMake Error at /OE/build/oe-core/tmp-eglibc/sysroots/x86_64-linux/usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:108 (message):
    Could NOT find Neon (missing: NEON_LIBRARIES)
  Call Stack (most recent call first):
    /OE/build/oe-core/tmp-eglibc/sysroots/x86_64-linux/usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:315 (_FPHSA_FAILURE_MESSAGE)
    cmake/modules/FindNeon.cmake:19 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
    CMakeLists.txt:22 (FIND_PACKAGE)

  -- Configuring incomplete, errors occurred!
  See also "/OE/build/oe-core/tmp-eglibc/work/i586-oe-linux/libmusicbrainz/5.0.1+gitAUTOINC+0749dd0a35-r1/git/build-native/CMakeFiles/CMakeOutput.log".
  make: *** No rule to make target 'make-c-interface'.  Stop.
  ...
  -- Found PkgConfig: /OE/build/oe-core/tmp-eglibc/sysroots/x86_64-linux/usr/bin/pkg-config (found version "0.28")
  -- checking for module 'neon'
  --   found neon, version 0.30.0
  -- Found Neon: /OE/build/oe-core/tmp-eglibc/sysroots/qemux86/usr/lib/libneon.so
  CMake Error at src/CMakeLists.txt:19 (INCLUDE):
    include could not find load file:
    /OE/build/oe-core/tmp-eglibc/work/i586-oe-linux/libmusicbrainz/5.0.1+gitAUTOINC+0749dd0a35-r1/git/build-native/ImportExecutables.cmake
  -- Configuring incomplete, errors occurred!

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>