package/gr-osmosdr: fix python build

Fix the following python build failure:

In file included from /home/buildroot/instance-0/output-1/host/include/python3.11/Python.h:38,
                 from /home/buildroot/instance-0/output-1/host/arc-buildroot-linux-gnu/sysroot/usr/include/pybind11/detail/common.h:266,
                 from /home/buildroot/instance-0/output-1/host/arc-buildroot-linux-gnu/sysroot/usr/include/pybind11/attr.h:13,
                 from /home/buildroot/instance-0/output-1/host/arc-buildroot-linux-gnu/sysroot/usr/include/pybind11/detail/class.h:12,
                 from /home/buildroot/instance-0/output-1/host/arc-buildroot-linux-gnu/sysroot/usr/include/pybind11/pybind11.h:13,
                 from /home/buildroot/instance-0/output-1/build/gr-osmosdr-0.2.4/python/bindings/device_python.cc:1:
/home/buildroot/instance-0/output-1/host/include/python3.11/pyport.h:596:2: error: #error "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)."
  596 | #error "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)."
      |  ^~~~~

Fixes:
 - http://autobuild.buildroot.org/results/f009958c37902a224512b336fcb431903bdd0b96

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/gr-osmosdr/gr-osmosdr.mk

@@ -23,7 +23,9 @@ GR_OSMOSDR_CONF_OPTS = \
 GR_OSMOSDR_INSTALL_STAGING = YES
 
 ifeq ($(BR2_PACKAGE_GNURADIO_PYTHON),y)
-GR_OSMOSDR_CONF_OPTS += -DENABLE_PYTHON=ON
+GR_OSMOSDR_CONF_OPTS += \
+	-DENABLE_PYTHON=ON \
+	-DPYTHON_INCLUDE_DIRS=$(STAGING_DIR)/usr/include/python$(PYTHON3_VERSION_MAJOR)
 GR_OSMOSDR_DEPENDENCIES += python3 host-python-six
 else
 GR_OSMOSDR_CONF_OPTS += -DENABLE_PYTHON=OFF