Reformat LDFLAGS and remove invalid main.Flags

[skip changelog]

aerc.spec

@@ -59,11 +59,13 @@ echo 'golang(github.com/brunnre8/go.notmuch)'
 
 %build
 export BUILDTAGS=notmuch
-export LDFLAGS="-X main.Version=%{version} \
+export LDFLAGS="\
+                -X main.Version=%{version} \
                 -X main.Prefix=%{_prefix} \
-                -X main.Flags=$(echo -- $(GOFLAGS) | base64 | tr -d '\r\n') \
+                -X main.ShareDir=%{_datadir}/aerc \
                 -X git.sr.ht/~rjarry/aerc/config.shareDir=%{_datadir} \
-                -X git.sr.ht/~rjarry/aerc/config.libexecDir=%{_libexecdir}"
+                -X git.sr.ht/~rjarry/aerc/config.libexecDir=%{_libexecdir} \
+               "
 %gobuild -o aerc %{goipath}
 
 # The go macros interfere with C build flags.