spec: Advertise nvram paths of official fedora edk2 builds

Fedora now ships edk2 firmware in its official repos, so adapt
the nvram path list to match. Eventually we can remove the nightly
links as well once some integration kinks have been worked out,
and documentation updated.

Move the macro building into the %build target, which lets us
build up a shell variable and make things a bit more readable

https://bugzilla.redhat.com/show_bug.cgi?id=1335395

libvirt.spec.in

@@ -192,12 +192,6 @@
 %define qemu_group  qemu
 
 
-# Advertise OVMF and AAVMF from nightly firmware repo
-%if 0%{?fedora}
-    %define arg_loader_nvram --with-loader-nvram="/usr/share/edk2.git/ovmf-x64/OVMF_CODE-pure-efi.fd:/usr/share/edk2.git/ovmf-x64/OVMF_VARS-pure-efi.fd:/usr/share/edk2.git/aarch64/QEMU_EFI-pflash.raw:/usr/share/edk2.git/aarch64/vars-template-pflash.raw"
-%endif
-
-
 %if 0%{?fedora} || 0%{?rhel} >= 7
     %define with_systemd_macros 1
 %else
@@ -1097,6 +1091,18 @@ rm -rf .git
     %define arg_selinux_mount --with-selinux-mount="/selinux"
 %endif
 
+%if 0%{?fedora}
+    # Nightly firmware repo x86/OVMF
+    LOADERS="/usr/share/edk2.git/ovmf-x64/OVMF_CODE-pure-efi.fd:/usr/share/edk2.git/ovmf-x64/OVMF_VARS-pure-efi.fd"
+    # Nightly firmware repo aarch64/AAVMF
+    LOADERS="$LOADERS:/usr/share/edk2.git/aarch64/QEMU_EFI-pflash.raw:/usr/share/edk2.git/aarch64/vars-template-pflash.raw"
+    # Fedora official x86/OVMF
+    LOADERS="$LOADERS:/usr/share/edk2/ovmf/OVMF_CODE.fd:/usr/share/edk2/ovmf/OVMF_VARS.fd"
+    # Fedora official aarch64/AAVMF
+    LOADERS="$LOADERS:/usr/share/edk2/aarch64/QEMU_EFI-pflash.raw:/usr/share/edk2/aarch64/vars-template-pflash.raw"
+    %define arg_loader_nvram --with-loader-nvram="$LOADERS"
+%endif
+
 # place macros above and build commands below this comment
 
 %if 0%{?enable_autotools}