python: build: follow standard semantics for DESTDIR and PREFIX

Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>

diff -durN python.orig/audit2allow/Makefile python/audit2allow/Makefile
--- python.orig/audit2allow/Makefile	2017-08-04 15:31:00.000000000 +0200
+++ python/audit2allow/Makefile	2018-01-17 09:44:35.659573123 +0100
@@ -1,19 +1,17 @@
 PYTHON ?= python
 
 # Installation directories.
-PREFIX ?= $(DESTDIR)/usr
-BINDIR ?= $(PREFIX)/bin
-LIBDIR ?= $(PREFIX)/lib
-MANDIR ?= $(PREFIX)/share/man
-LOCALEDIR ?= /usr/share/locale
-INCLUDEDIR ?= $(PREFIX)/include
-LIBSEPOLA ?= $(LIBDIR)/libsepol.a
+PREFIX ?= /usr
+BINDIR ?= $(DESTDIR)$(PREFIX)/bin
+LIBDIR ?= $(DESTDIR)$(PREFIX)/lib
+MANDIR ?= $(DESTDIR)$(PREFIX)/share/man
 
 CFLAGS ?= -Werror -Wall -W
 
 all: audit2why sepolgen-ifgen-attr-helper
 
-sepolgen-ifgen-attr-helper: sepolgen-ifgen-attr-helper.o $(LIBSEPOLA)
+sepolgen-ifgen-attr-helper: sepolgen-ifgen-attr-helper.o
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ -l:libsepol.a
 
 audit2why:
 	ln -sf audit2allow audit2why
diff -durN python.orig/chcat/Makefile python/chcat/Makefile
--- python.orig/chcat/Makefile	2017-08-04 15:31:00.000000000 +0200
+++ python/chcat/Makefile	2018-01-17 09:44:35.659573123 +0100
@@ -1,8 +1,8 @@
 # Installation directories.
-PREFIX ?= $(DESTDIR)/usr
-BINDIR ?= $(PREFIX)/bin
-MANDIR ?= $(PREFIX)/share/man
-LOCALEDIR ?= $(PREFIX)/share/locale
+PREFIX ?= /usr
+BINDIR ?= $(DESTDIR)$(PREFIX)/bin
+MANDIR ?= $(DESTDIR)$(PREFIX)/share/man
+LOCALEDIR ?= $(DESTDIR)$(PREFIX)/share/locale
 
 .PHONY: all
 all: chcat
diff -durN python.orig/semanage/Makefile python/semanage/Makefile
--- python.orig/semanage/Makefile	2017-08-04 15:31:00.000000000 +0200
+++ python/semanage/Makefile	2018-01-17 09:44:43.676239705 +0100
@@ -1,13 +1,12 @@
 PYTHON ?= python
 
 # Installation directories.
-PREFIX ?= $(DESTDIR)/usr
-LIBDIR ?= $(PREFIX)/lib
-SBINDIR ?= $(PREFIX)/sbin
-MANDIR = $(PREFIX)/share/man
-PYTHONLIBDIR ?= $(shell $(PYTHON) -c "from distutils.sysconfig import *; print(get_python_lib(1))")
+PREFIX ?= /usr
+SBINDIR ?= $(DESTDIR)$(PREFIX)/sbin
+MANDIR = $(DESTDIR)$(PREFIX)/share/man
+PYTHONLIBDIR ?= $(shell $(PYTHON) -c "from distutils.sysconfig import *; print(get_python_lib(prefix='$(PREFIX)'))")
 PACKAGEDIR ?= $(DESTDIR)/$(PYTHONLIBDIR)
-BASHCOMPLETIONDIR ?= $(DESTDIR)/usr/share/bash-completion/completions
+BASHCOMPLETIONDIR ?= $(DESTDIR)$(PREFIX)/share/bash-completion/completions
 
 TARGETS=semanage
 
diff -durN python.orig/sepolgen/src/sepolgen/Makefile python/sepolgen/src/sepolgen/Makefile
--- python.orig/sepolgen/src/sepolgen/Makefile	2017-08-04 15:31:00.000000000 +0200
+++ python/sepolgen/src/sepolgen/Makefile	2018-01-17 09:44:35.659573123 +0100
@@ -1,5 +1,6 @@
+PREFIX ?= /usr
 PYTHON ?= python
-PYTHONLIBDIR ?= $(shell $(PYTHON) -c "from distutils.sysconfig import *; print(get_python_lib(1))")
+PYTHONLIBDIR ?= $(shell $(PYTHON) -c "from distutils.sysconfig import *; print(get_python_lib(prefix='$(PREFIX)'))")
 PACKAGEDIR ?= $(DESTDIR)/$(PYTHONLIBDIR)/sepolgen
 
 all:
diff -durN python.orig/sepolicy/Makefile python/sepolicy/Makefile
--- python.orig/sepolicy/Makefile	2017-08-04 15:31:00.000000000 +0200
+++ python/sepolicy/Makefile	2018-01-17 09:44:35.659573123 +0100
@@ -1,14 +1,14 @@
 PYTHON ?= python
 
 # Installation directories.
-PREFIX ?= $(DESTDIR)/usr
-LIBDIR ?= $(PREFIX)/lib
-BINDIR ?= $(PREFIX)/bin
-DATADIR ?= $(PREFIX)/share
-MANDIR ?= $(PREFIX)/share/man
-LOCALEDIR ?= /usr/share/locale
-BASHCOMPLETIONDIR ?= $(DESTDIR)/usr/share/bash-completion/completions
-SHAREDIR ?= $(PREFIX)/share/sandbox
+PREFIX ?= /usr
+LIBDIR ?= $(DESTDIR)$(PREFIX)/lib
+BINDIR ?= $(DESTDIR)$(PREFIX)/bin
+DATADIR ?= $(DESTDIR)$(PREFIX)/share
+MANDIR ?= $(DESTDIR)$(PREFIX)/share/man
+LOCALEDIR ?= $(DESTDIR)$(PREFIX)/share/locale
+BASHCOMPLETIONDIR ?= $(DESTDIR)$(PREFIX)/share/bash-completion/completions
+SHAREDIR ?= $(DESTDIR)$(PREFIX)/share/sandbox
 CFLAGS ?= -Wall -Werror -Wextra -W
 override CFLAGS += -DPACKAGE="policycoreutils" -DSHARED -shared
 
@@ -30,7 +30,7 @@
 	@$(PYTHON) test_sepolicy.py -v
 
 install:
-	$(PYTHON) setup.py install `test -n "$(DESTDIR)" && echo --root $(DESTDIR)`
+	$(PYTHON) setup.py install --prefix=$(PREFIX) `test -n "$(DESTDIR)" && echo --root $(DESTDIR)`
 	[ -d $(BINDIR) ] || mkdir -p $(BINDIR)
 	install -m 755 sepolicy.py $(BINDIR)/sepolicy
 	(cd $(BINDIR); ln -sf sepolicy sepolgen)