Sync LDFLAGS definition with upstream Makefile

[skip changelog]

aerc.spec

@@ -61,12 +61,11 @@ sed -i "s|golang.org/x/crypto|github.com/ProtonMail/go-crypto|" $(find . -name "
 %build
 export BUILDTAGS=notmuch
 export LDFLAGS="\
-                -X main.Version=%{version} \
-                -X main.Prefix=%{_prefix} \
-                -X main.ShareDir=%{_datadir}/aerc \
-                -X git.sr.ht/~rjarry/aerc/config.shareDir=%{_datadir} \
-                -X git.sr.ht/~rjarry/aerc/config.libexecDir=%{_libexecdir} \
-               "
+    -X main.Version=%{version} \
+    -X main.Date="$(date -d "@${SOURCE_DATE_EPOCH}" +%Y-%m-%d)" \
+    -X git.sr.ht/~rjarry/aerc/config.shareDir=%{_datadir} \
+    -X git.sr.ht/~rjarry/aerc/config.libexecDir=%{_libexecdir} \
+    "
 %gobuild -o aerc %{goipath}
 
 # The go macros interfere with C build flags.