This patch fixes pkg config nntrainer include directory for the pkg.
**Self evaluation:**
1. Build test: [X]Passed [ ]Failed [ ]Skipped
2. Run test: [X]Passed [ ]Failed [ ]Skipped
Signed-off-by: Jihoon Lee <jhoon.it.lee@samsung.com>
nntrainer_conf.set('EXEC_PREFIX', nntrainer_bindir)
nntrainer_conf.set('LIB_INSTALL_DIR', nntrainer_libdir)
nntrainer_conf.set('PLUGIN_INSTALL_PREFIX', nntrainer_libdir / 'nntrainer')
-nntrainer_conf.set('INCLUDE_INSTALL_DIR', nntrainer_includedir)
+nntrainer_conf.set('INCLUDE_INSTALL_DIR', nntrainer_includedir / '..')
nntrainer_conf.set('CAPI_ML_COMMON_DEP', get_option('capi-ml-common-actual'))
dummy_dep = dependency('', required: false)