package/python-pillow: bump to version 8.0.1

Bumping the package requires two fixes:
* pillow looks for header files in paths returned by pkg-config.
  On buildroot, pkg-config returns nothing if PKG_CONFIG_ALLOW_SYSTEM_CFLAGS
  is disabled.
* png is the default pillow image format and png format is working only
  if python zlib module is available.

Signed-off-by: Angelo Compagnucci <angelo@amarulasolutions.com>
Tested-by: Adam Duskett <aduskett@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/python-pillow/Config.in

@@ -2,6 +2,7 @@ config BR2_PACKAGE_PYTHON_PILLOW
 	bool "python-pillow"
 	depends on BR2_PACKAGE_PYTHON3
 	select BR2_PACKAGE_PYTHON3_PYEXPAT # runtime
+	select BR2_PACKAGE_PYTHON3_ZLIB
 	help
 	  Pillow is the "friendly" PIL fork by Alex Clark and
 	  Contributors. PIL is the Python Imaging Library by Fredrik

package/python-pillow/python-pillow.hash

@@ -1,5 +1,4 @@
 # md5, sha256 from https://pypi.org/project/Pillow/
-md5	f1f7592c51260e5080d3cd71781ea675  Pillow-7.1.2.tar.gz
-sha256	97f9e7953a77d5a70f49b9a48da7776dc51e9b738151b22dacf101641594a626  Pillow-7.2.0.tar.gz
+sha256	11c5c6e9b02c9dac08af04f093eb5a2f84857df70a7d4a6a6ad461aca803fb9e  Pillow-8.0.1.tar.gz
 # Locally computed sha256 checksums
 sha256	37de42abe33a247e8f03d2313657a0f174a239a198f526add6544ff3e2643b81  LICENSE

package/python-pillow/python-pillow.mk

@@ -4,8 +4,8 @@
 #
 ################################################################################
 
-PYTHON_PILLOW_VERSION = 7.2.0
-PYTHON_PILLOW_SITE = https://files.pythonhosted.org/packages/3e/02/b09732ca4b14405ff159c470a612979acfc6e8645dc32f83ea0129709f7a
+PYTHON_PILLOW_VERSION = 8.0.1
+PYTHON_PILLOW_SITE = https://files.pythonhosted.org/packages/2b/06/93bf1626ef36815010e971a5ce90f49919d84ab5d2fa310329f843a74bc1
 PYTHON_PILLOW_SOURCE = Pillow-$(PYTHON_PILLOW_VERSION).tar.gz
 PYTHON_PILLOW_LICENSE = PIL Software License
 PYTHON_PILLOW_LICENSE_FILES = LICENSE
@@ -47,15 +47,9 @@ else
 PYTHON_PILLOW_BUILD_OPTS += --disable-webp
 endif
 
-ifeq ($(BR2_PACKAGE_ZLIB),y)
-PYTHON_PILLOW_DEPENDENCIES += zlib
-PYTHON_PILLOW_BUILD_OPTS += --enable-zlib
-else
-PYTHON_PILLOW_BUILD_OPTS += --disable-zlib
-endif
-
 define PYTHON_PILLOW_BUILD_CMDS
 	cd $(PYTHON_PILLOW_BUILDDIR); \
+		PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=1 \
 		$(PYTHON_PILLOW_BASE_ENV) $(PYTHON_PILLOW_ENV) \
 		$(PYTHON_PILLOW_PYTHON_INTERPRETER) setup.py build_ext \
 		$(PYTHON_PILLOW_BASE_BUILD_OPTS) $(PYTHON_PILLOW_BUILD_OPTS)
@@ -63,6 +57,7 @@ endef
 
 define PYTHON_PILLOW_INSTALL_TARGET_CMDS
 	cd $(PYTHON_PILLOW_BUILDDIR); \
+		PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=1 \
 		$(PYTHON_PILLOW_BASE_ENV) $(PYTHON_PILLOW_ENV) \
 		$(PYTHON_PILLOW_PYTHON_INTERPRETER) setup.py build_ext \
 		$(PYTHON_PILLOW_BUILD_OPTS) install \