[PATCH] build: silence warning from autoconf

[Eric Blake <eblake@xxxxxxxxxx>]

Autoconf 2.60 and later insist on using ${datarootdir}, rather than
the derived ${datadir} (although the latter defaults to the former,
it is possible to set configure arguments so that they differ):

config.status: creating libvirt.pc
config.status: WARNING:  'libvirt.pc.in' seems to ignore the --datarootdir setting

This patch follows the autoconf manual's suggestions for how to
support 2.59 (RHEL 5) and newer simultaneously.

* libvirt.pc.in (datarootdir): Define, so ${datadir} will not ignore
datarootdir when using newer autoconf.
---

https://www.gnu.org/software/autoconf/manual/autoconf.html#Changed-Directory-Variables

 libvirt.pc.in |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/libvirt.pc.in b/libvirt.pc.in
index 3d999a8..616575d 100644
--- a/libvirt.pc.in
+++ b/libvirt.pc.in
@@ -2,6 +2,7 @@ prefix=@prefix@
 exec_prefix=@exec_prefix@
 libdir=@libdir@
 includedir=@includedir@
+datarootdir=@datarootdir@

 libvirt_api=@datadir@/libvirt/api/libvirt-api.xml
 libvirt_qemu_api=@datadir@/libvirt/api/libvirt-qemu-api.xml
-- 
1.7.7.6

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