libvirt.spec.in: Add the Secure Boot-variant OVMF binaries

Currently the RPM spec doesn't add the 'secboot'-variant OVMF binaries
(an unintentional omission, checking with Cole on #virt, OFTC) for
'x86_64' and 'ia32'.  Add them.

This way, getDomainCapabilities() will report all the OVMF binaries that
are present on the system.  E.g. on Fedora 29, if you only have the
edk2-ovmf-20190308stable-1.fc29.noarch package installed, then running
`virsh domcapabilities` will enumerate _both_ the OVMF binaries (instead
of just the OVMF_CODE.fd):

  $> virsh getdomcapabilities
    ...
    <loader supported='yes'>
      <value>/usr/share/edk2/ovmf/OVMF_CODE.fd</value>
      <value>/usr/share/edk2/ovmf/OVMF_CODE.secboot.fd</value>
    ...

(
Learnt this from a discussion with Michal Privoznik in this bug,
comment#2:

    https://bugzilla.redhat.com/show_bug.cgi?id=1733940 -- RFE: Report
    firmware (FW) paths in domainCapabilities based on FW descriptor
    files
)
Signed-off-by: NKashyap Chamarthy <kchamart@redhat.com>
Reviewed-by: NCole Robinson <crobinso@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

libvirt.spec.in

@@ -1135,10 +1135,17 @@ exit 1
     # Nightly edk2.git-arm
     LOADERS="$LOADERS:/usr/share/edk2.git/arm/QEMU_EFI-pflash.raw:/usr/share/edk2.git/arm/vars-template-pflash.raw"
 
-    # Fedora edk2-ovmf
+    # Fedora edk2-ovmf, x86_64
     LOADERS="$LOADERS:/usr/share/edk2/ovmf/OVMF_CODE.fd:/usr/share/edk2/ovmf/OVMF_VARS.fd"
+    # Fedora edk2-ovmf, x86_64, with Secure Boot
+    LOADERS="$LOADERS:/usr/share/edk2/ovmf/OVMF_CODE.secboot.fd:/usr/share/edk2/ovmf/OVMF_VARS.secboot.fd"
     # Fedora edk2-ovmf-ia32
     LOADERS="$LOADERS:/usr/share/edk2/ovmf-ia32/OVMF_CODE.fd:/usr/share/edk2/ovmf-ia32/OVMF_VARS.fd"
+    # Fedora edk2-ovmf-ia32, with Secure Boot.  (NB: Unlike x86_64, for
+    # 'ia32', there is no secboot-variant "VARS" file (NVRAM template).
+    # So the NVRAM template for 'ovmf-ia32/OVMF_CODE.secboot.fd' is the
+    # same as the one for the non-secboot variant.)
+    LOADERS="$LOADERS:/usr/share/edk2/ovmf-ia32/OVMF_CODE.secboot.fd:/usr/share/edk2/ovmf-ia32/OVMF_VARS.fd"
     # Fedora edk2-aarch64
     LOADERS="$LOADERS:/usr/share/edk2/aarch64/QEMU_EFI-pflash.raw:/usr/share/edk2/aarch64/vars-template-pflash.raw"
     # Fedora edk2-arm