glmark2: depend on host-python

The waf build system of glmark2 needs Python 2 as stated on its README
file:

python 2.x (>= 2.4) for the build system (waf)

Building it with a system with Python 3 as the default Python version
will result on a failure like this one:

File "waflib/Utils.py", line 199
    except OSError ,e:
                   ^
SyntaxError: invalid syntax

So, in order to fix this, make this package depending on host-python and
also run the waf script using $(HOST_DIR)/usr/bin/python2.

At the same time delete 3 Python environment variables passed to the waf
script during the configure phase which it seems there aren't needed for
anything.

Fixes:

  http://autobuild.buildroot.net/results/fc6/fc6cd2a90bbb0e6f80f6c4afaae1430f82e54046/

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/glmark2/glmark2.mk

@@ -8,7 +8,7 @@ GLMARK2_VERSION = 499aa81a68fb4c8aac1c80f0d6a4cce05941c4cc
 GLMARK2_SITE = $(call github,glmark2,glmark2,$(GLMARK2_VERSION))
 GLMARK2_LICENSE = GPLv3+ SGIv1
 GLMARK2_LICENSE_FILES = COPYING COPYING.SGI
-GLMARK2_DEPENDENCIES = host-pkgconf jpeg libpng \
+GLMARK2_DEPENDENCIES = host-pkgconf host-python jpeg libpng \
 	$(if $(BR2_PACKAGE_HAS_LIBEGL),libegl) \
 	$(if $(BR2_PACKAGE_HAS_LIBGLES),libgles) \
 	$(if $(BR2_PACKAGE_HAS_LIBGL),libgl)
@@ -47,21 +47,18 @@ GLMARK2_CONF_OPTS += \
 
 define GLMARK2_CONFIGURE_CMDS
 	(cd $(@D); \
-		PYTHON_CONFIG="$(STAGING_DIR)/usr/bin/python-config" \
-		python_LDFLAGS="" \
-		python_LIBDIR="" \
 		$(TARGET_CONFIGURE_OPTS) \
 		$(GLMARK2_CONF_ENV) \
-		./waf configure $(GLMARK2_CONF_OPTS) \
+		$(HOST_DIR)/usr/bin/python2 ./waf configure $(GLMARK2_CONF_OPTS) \
 	)
 endef
 
 define GLMARK2_BUILD_CMDS
-	cd $(@D) && $(TARGET_MAKE_ENV) ./waf
+	cd $(@D) && $(TARGET_MAKE_ENV) $(HOST_DIR)/usr/bin/python2 ./waf
 endef
 
 define GLMARK2_INSTALL_TARGET_CMDS
-	cd $(@D) && $(TARGET_MAKE_ENV) ./waf install --destdir=$(TARGET_DIR)
+	cd $(@D) && $(TARGET_MAKE_ENV) $(HOST_DIR)/usr/bin/python2 ./waf install --destdir=$(TARGET_DIR)
 endef
 
 $(eval $(generic-package))