numpy: Fix compilation when OpenBLAS support is not enabled

Currently, if OpenBLAS support is not enabled, a site.cfg file is not
written and numpy will use build host paths for libraries. If the build
host has any conflicting libraries, specifically libpython3.10.a, then
compilation will fail.

This ensures site.cfg is always written with buildroot paths.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/python/numpy/Makefile

@@ -7,7 +7,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=numpy
 PKG_VERSION:=1.23.3
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 PYPI_NAME:=$(PKG_NAME)
 PKG_HASH:=51bf49c0cd1d52be0a240aa66f3458afc4b95d8993d2d04f0d91fa60c10af6cd
@@ -23,6 +23,10 @@ PKG_CONFIG_DEPENDS:= \
 
 PKG_BUILD_DEPENDS:=python-cython/host
 
+# Ensure numpy does not find openblas if openblas support is not enabled
+PYTHON3_PKG_BUILD_VARS:= \
+        $(if $(CONFIG_NUMPY_OPENBLAS_SUPPORT),,NPY_BLAS_ORDER= NPY_LAPACK_ORDER= )
+
 include ../pypi.mk
 include $(INCLUDE_DIR)/package.mk
 include ../python3-package.mk
@@ -50,17 +54,18 @@ config NUMPY_OPENBLAS_SUPPORT
 endmenu
 endef
 
-ifdef CONFIG_NUMPY_OPENBLAS_SUPPORT
 define Build/Prepare/numpy-sitecfg
 	echo "[DEFAULT]"                                 >  $(PKG_BUILD_DIR)/site.cfg
 	echo "library_dirs = $(STAGING_DIR)/usr/lib"     >> $(PKG_BUILD_DIR)/site.cfg
 	echo "include_dirs = $(STAGING_DIR)/usr/include" >> $(PKG_BUILD_DIR)/site.cfg
+
+  ifdef CONFIG_NUMPY_OPENBLAS_SUPPORT
 	echo                                             >> $(PKG_BUILD_DIR)/site.cfg
 	echo "[openblas]"                                >> $(PKG_BUILD_DIR)/site.cfg
 	echo "libraries = openblas"                      >> $(PKG_BUILD_DIR)/site.cfg
 	echo "runtime_library_dirs = /usr/lib"           >> $(PKG_BUILD_DIR)/site.cfg
+  endif
 endef
-endif
 
 define Build/Prepare
 	$(call Build/Prepare/Default)