libselinux: Honor PREFIX for shared libraries

Use `PREFIX` in `SHLIBDIR` just like for the other directories.

Signed-off-by: Quentin Minster Picavet <[email protected]>

libselinux/src/Makefile

@@ -10,7 +10,7 @@ PKG_CONFIG ?= pkg-config
 # Installation directories.
 PREFIX ?= /usr
 LIBDIR ?= $(PREFIX)/lib
-SHLIBDIR ?= /lib
+SHLIBDIR ?= $(PREFIX)/lib
 INCLUDEDIR ?= $(PREFIX)/include
 PYINC ?= $(shell $(PKG_CONFIG) --cflags $(PYPREFIX))
 PYLIBS ?= $(shell $(PKG_CONFIG) --libs $(PYPREFIX))