pkg-python: use $(HOST_DIR) instead of $(HOST_DIR)/usr as prefix

Remove the redundant usr/ component of the HOST_DIR paths. Since a
previous commit added a symlink from $(HOST_DIR)/usr to $(HOST_DIR),
everything keeps on working.

Build-tested with a bunch of python packages.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Reviewed-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/pkg-python.mk

@@ -53,7 +53,7 @@ HOST_PKG_PYTHON_DISTUTILS_ENV = \
 	PYTHONNOUSERSITE=1
 
 HOST_PKG_PYTHON_DISTUTILS_INSTALL_OPTS = \
-	--prefix=$(HOST_DIR)/usr
+	--prefix=$(HOST_DIR)
 
 # Target setuptools-based packages
 PKG_PYTHON_SETUPTOOLS_ENV = \
@@ -83,7 +83,7 @@ HOST_PKG_PYTHON_SETUPTOOLS_ENV = \
 	PYTHONNOUSERSITE=1
 
 HOST_PKG_PYTHON_SETUPTOOLS_INSTALL_OPTS = \
-	--prefix=$(HOST_DIR)/usr
+	--prefix=$(HOST_DIR)
 
 ################################################################################
 # inner-python-package -- defines how the configuration, compilation