package/pkg-python.mk: fix typo

Commit 6b915358babe introduced PKG_PYTHON_MATURIN_INSTALL_CMD while
it should be HOST_PKG_PYTHON_MATURIN_INSTALL_CMD.

Adding any new host python package using maturin setup type will
fail during the install step.

Fixes: 6b915358babe37a721b4f6e032ec884174bd6e0b

Cc: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/pkg-python.mk

@@ -258,8 +258,8 @@ HOST_PKG_PYTHON_MATURIN_ENV = \
 HOST_PKG_PYTHON_MATURIN_BUILD_CMD = \
 	$(HOST_PKG_PYTHON_PEP517_BUILD_CMD)
 
-PKG_PYTHON_MATURIN_INSTALL_CMD = \
-	$(PKG_PYTHON_PEP517_INSTALL_CMD)
+HOST_PKG_PYTHON_MATURIN_INSTALL_CMD = \
+	$(HOST_PKG_PYTHON_PEP517_INSTALL_CMD)
 
 ################################################################################
 # inner-python-package -- defines how the configuration, compilation