package/python-numpy: add reverse dependency on packages using python-numpy

Since commit 1aa59097e61d524bb55ab1fcd4fbe5098b3e0bed[1] is merged, a
new build failure occurs when selecting packages which needs
python-numpy as dependency.

This fix a build issue[2] by adding the correct reverse dependencies
to the following packages :
- gnuradio (for python support)
- opencv3 (for python support)
- piglit
- python-matplotlib

So :
- adding to every listed packages
  `depends on !(BR2_TOOLCHAIN_USES_GLIBC || BR2_TOOLCHAIN_USES_MUSL)`
  and add a comment to explain what happend.

[1] https://git.buildroot.net/buildroot/commit/?id=1aa59097e61d524bb55ab1fcd4fbe5098b3e0bed
[2] http://autobuild.buildroot.org/results/b76/b76b6cf9602bcf5df69a7276762eab54cf74007b

Signed-off-by: Alexandre PAYEN <alexandre.payen@smile.fr>
Cc: Alexey Brodkin <Alexey.Brodkin@synopsys.com>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Damien DUVAL <damien.duval@smile.fr>
Cc: Romain Naour <romain.naour@smile.fr>
Reviewed-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 7a546b87d5b8781b03f3ba5d311d61f4169ee899)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gnuradio/Config.in

@@ -66,11 +66,15 @@ config BR2_PACKAGE_GNURADIO_PYTHON
 	bool "python support"
 	depends on BR2_PACKAGE_PYTHON
 	depends on BR2_PACKAGE_PYTHON_NUMPY_ARCH_SUPPORTS
+	depends on BR2_TOOLCHAIN_USES_GLIBC || BR2_TOOLCHAIN_USES_MUSL # python-numpy
 	select BR2_PACKAGE_BOOST_PYTHON
 	select BR2_PACKAGE_PYTHON_NUMPY # runtime
 	help
 	  Enable python component
 
+comment "python support needs glibc or musl"
+	depends on !(BR2_TOOLCHAIN_USES_GLIBC || BR2_TOOLCHAIN_USES_MUSL)
+
 config BR2_PACKAGE_GNURADIO_UTILS
 	bool "gr-utils support"
 	depends on BR2_PACKAGE_GNURADIO_PYTHON

package/opencv3/Config.in

@@ -157,11 +157,15 @@ config BR2_PACKAGE_OPENCV3_LIB_PYTHON
 	bool "python"
 	depends on BR2_PACKAGE_PYTHON || BR2_PACKAGE_PYTHON3
 	depends on BR2_PACKAGE_PYTHON_NUMPY_ARCH_SUPPORTS
+	depends on BR2_TOOLCHAIN_USES_GLIBC || BR2_TOOLCHAIN_USES_MUSL # python-numpy
 	select BR2_PACKAGE_PYTHON_NUMPY
 	help
 	  Include opencv_python module into the OpenCV build.  No
 	  python example is installed.
 
+comment "python support needs glibc or musl"
+	depends on !(BR2_TOOLCHAIN_USES_GLIBC || BR2_TOOLCHAIN_USES_MUSL)
+
 config BR2_PACKAGE_OPENCV3_LIB_SHAPE
 	bool "shape"
 	# opencv_core dependency is already enabled