test/T355-smime: Use key as exported by gpgsm

As reported in id:87h7pxiek3.fsf@tethera.net, the previous version of
the test is flaky. There is some so-far undebugged interaction between
openssl and gpgsm that causes the keys to fail to import. As a
potential workaround, use the key as exported by gpgsm, and eliminate
openssl from this particular pipeline.

test/smime/0xE0972A47.p12

@@ -0,0 +1,62 @@
+Issuer ...: /CN=Notmuch Test Suite
+Serial ...: 6F748C94BD0C67A9
+Subject ..: /CN=Notmuch Test Suite
+    aka ..: test_suite@notmuchmail.org
+Keygrip ..: 1727B9C7108D50333614F3B1DD0807F624B31130
+
+-----BEGIN PKCS12-----
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test/test-lib.sh

@@ -143,10 +143,8 @@ add_gpgsm_home () {
     _gnupg_exit () { gpgconf --kill all 2>/dev/null || true; }
     at_exit_function _gnupg_exit
     mkdir -p -m 0700 "$GNUPGHOME"
-    openssl pkcs12 -export -passout pass: -inkey "$NOTMUCH_SRCDIR/test/smime/key+cert.pem" \
-	< "$NOTMUCH_SRCDIR/test/smime/test.crt" | \
-	gpgsm --batch --no-tty --no-common-certs-import --pinentry-mode=loopback --passphrase-fd 3 \
-	      --disable-dirmngr --import  >"$GNUPGHOME"/import.log 2>&1 3<<<''
+    gpgsm --batch --no-tty --no-common-certs-import --pinentry-mode=loopback --passphrase-fd 3 \
+	  --disable-dirmngr --import  >"$GNUPGHOME"/import.log 2>&1 3<<<'' <$NOTMUCH_SRCDIR/test/smime/0xE0972A47.p12
     fpr=$(gpgsm --batch --list-key test_suite@notmuchmail.org | sed -n 's/.*fingerprint: //p')
     echo "$fpr S relax" >> "$GNUPGHOME/trustlist.txt"
     gpgsm --quiet --batch --no-tty --no-common-certs-import --disable-dirmngr --import < $NOTMUCH_SRCDIR/test/smime/ca.crt