[speex] Use native autotools for all triplets

[dg0yt]

Alternative to #26487 (comment).

• What does your PR fix?

  Use the native build system for all triplets. Fixes mingw builds.
  Adds speexdsp dependency/feature control.

• Which triplets are supported/not supported? Have you updated the CI baseline?

  unchanged, no

• Does your PR follow the maintainer guide?

  yes

• If you have added/updated a port: Have you run ./vcpkg x-add-version --all and committed the result?

  yes

[github-actions]

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After committing all other changes, the version database must be updated

git add -u && git commit
git checkout 55112eb54a1c4cfaec5dd2592a39cea72f78ed56 -- versions
./vcpkg x-add-version --all

Diff

diff --git a/versions/baseline.json b/versions/baseline.json
index 8904762..14397cc 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -6846,7 +6846,7 @@
     },
     "speex": {
       "baseline": "1.2.1",
-      "port-version": 0
+      "port-version": 1
     },
     "speexdsp": {
       "baseline": "1.2.1",
diff --git a/versions/s-/speex.json b/versions/s-/speex.json
index 092587c..4d70e0e 100644
--- a/versions/s-/speex.json
+++ b/versions/s-/speex.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "7767d6043727a6f09f8a5ee6a33b42d0dceea5ba",
+      "version": "1.2.1",
+      "port-version": 1
+    },
     {
       "git-tree": "0520509fd60e20c5362959a7549dd29f7d04d54b",
       "version": "1.2.1",

[dan-shaw]

What does this patch do?

[dg0yt]

It fixes an upstream typo which broke that test. Cf. xiph/speex#20.