po: provide custom make rules for po file management

Historically we have relied on autopoint/gettextize to install a
standard po/Makefile.in.in. There is very limited scope for customizing
this and it also causes a bunch of extra stuff to be pulled into
configure.ac which potentially clashes with gnulib. Writing make rules
for po file management is no more difficult than any other rules libvirt
has, so stop using autopoint/gettextize.

Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

configure.ac

@@ -257,6 +257,7 @@ LIBVIRT_ARG_LIBSSH
 LIBVIRT_ARG_LIBXML
 LIBVIRT_ARG_MACVTAP
 LIBVIRT_ARG_NETCF
+LIBVIRT_ARG_NLS
 LIBVIRT_ARG_NSS
 LIBVIRT_ARG_NUMACTL
 LIBVIRT_ARG_OPENWSMAN
@@ -298,6 +299,7 @@ LIBVIRT_CHECK_LIBSSH
 LIBVIRT_CHECK_LIBXML
 LIBVIRT_CHECK_MACVTAP
 LIBVIRT_CHECK_NETCF
+LIBVIRT_CHECK_NLS
 LIBVIRT_CHECK_NUMACTL
 LIBVIRT_CHECK_NWFILTER
 LIBVIRT_CHECK_OPENWSMAN
@@ -732,33 +734,7 @@ if test "$enable_test_locking" = "yes"; then
 fi
 AM_CONDITIONAL([WITH_CIL],[test "$enable_test_locking" = "yes"])
 
-dnl Check for gettext - don't go any newer than what RHEL 5 supports
-dnl
-dnl save and restore CPPFLAGS around gettext check as the internal iconv
-dnl check might leave -I/usr/local/include in CPPFLAGS on FreeBSD resulting
-dnl in the build picking up previously installed libvirt/libvirt.h instead
-dnl of the correct one from the source tree.
-dnl compute the difference between save_CPPFLAGS and CPPFLAGS and append it
-dnl to INCLUDES in order to preserve changes made by gettext but in a place
-dnl that does not break the build
-save_CPPFLAGS="$CPPFLAGS"
-AM_GNU_GETTEXT_VERSION([0.17])
-AM_GNU_GETTEXT([external])
-GETTEXT_CPPFLAGS=
-if test "x$save_CPPFLAGS" != "x$CPPFLAGS"; then
- set dummy $CPPFLAGS; shift
- for var
- do
-   case " $var " in
-     " $save_CPPFLAGS ") ;;
-     *) GETTEXT_CPPFLAGS="$GETTEXT_CPPFLAGS $var" ;;
-   esac
- done
-fi
-CPPFLAGS="$save_CPPFLAGS"
-AC_SUBST([GETTEXT_CPPFLAGS])
-
-ALL_LINGUAS=`cd "$srcdir/po" > /dev/null && ls *.po | sed 's+\.po$++'`
+LIBVIRT_GETTEXT
 
 dnl Cygwin, MinGW and MSVC checks
 LIBVIRT_WIN_CHECK_COMMON
@@ -909,7 +885,7 @@ AC_CONFIG_FILES([\
         src/libvirt-qemu.pc \
         src/libvirt-lxc.pc \
         libvirt.spec mingw-libvirt.spec \
-        po/Makefile.in \
+        po/Makefile \
         include/libvirt/libvirt-common.h \
         examples/Makefile \
         tests/Makefile \
@@ -990,6 +966,7 @@ LIBVIRT_RESULT_LIBXL
 LIBVIRT_RESULT_LIBXML
 LIBVIRT_RESULT_MACVTAP
 LIBVIRT_RESULT_NETCF
+LIBVIRT_RESULT_NLS
 LIBVIRT_RESULT_NSS
 LIBVIRT_RESULT_NUMACTL
 LIBVIRT_RESULT_OPENWSMAN