python3: correctly fix PYTHON3_PATH

Commit 6251ccf03254f832c6e6ba0203ad46c18f217ca9 ('python3: fix the
value of PYTHON3_PATH') tried to fix the value of PYTHON3_PATH, but
did it incorrectly: it changed PYTHON_VERSION_MAJOR to
PYTHON_VERSION3_MAJOR, while it should have been
PYTHON3_VERSION_MAJOR.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/python3/python3.mk

@@ -169,7 +169,7 @@ HOST_PYTHON3_POST_INSTALL_HOOKS += HOST_PYTHON3_INSTALL_SYMLINK
 endif
 
 # Provided to other packages
-PYTHON3_PATH = $(TARGET_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)/sysconfigdata/:$(TARGET_DIR)/usr/lib/python$(PYTHON_VERSION3_MAJOR)/site-packages/
+PYTHON3_PATH = $(TARGET_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)/sysconfigdata/:$(TARGET_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)/site-packages/
 
 $(eval $(autotools-package))
 $(eval $(host-autotools-package))