selinux-python: fix No module named pip

When running the do install task run
into No modules named pip.

Add python3-pip-native to DEPENDS
so that pip it available.

PREFIX variable not being set also
appears to effect whether pip is
found or not. No reason was found
as to why that is.

Signed-off-by: Vincent Davis Jr <vince@underview.tech>
Signed-off-by: Yi Zhao <yi.zhao@windriver.com>

recipes-security/selinux/selinux-python_3.9.bb

@@ -16,7 +16,7 @@ SRC_URI += "file://0001-sepolicy-fix-install-path-for-new-pymodule-sepolicy.patc
 
 S = "${UNPACKDIR}/${BP}/python"
 
-DEPENDS = "libsepol libselinux gettext-native python3-setuptools-scm-native"
+DEPENDS = "libsepol libselinux gettext-native python3-setuptools-scm-native python3-pip-native"
 
 RDEPENDS:${PN} = "\
         python3-core \
@@ -111,7 +111,9 @@ FILES:${PN} += "\
 "
 
 do_install() {
-    oe_runmake DESTDIR="${D}" \
+    oe_runmake \
+        DESTDIR="${D}" \
+        PREFIX=${prefix} \
         PYLIBVER='python${PYTHON_BASEVERSION}' \
         PYTHONLIBDIR='${PYTHON_SITEPACKAGES_DIR}' \
         install