remove duplicate targets

Author: joaomoreno

azure-pipelines/playground.yml

@@ -24,12 +24,8 @@ extends:
         target: aarch64-unknown-linux-gnu
       - name: linux
         target: armv7-unknown-linux-gnueabihf
-      - name: linux
-        target: x86_64-unknown-linux-musl
       - name: linux
         target: aarch64-unknown-linux-gnu
-      - name: linux
-        target: x86_64-unknown-linux-musl
       - name: darwin
         target: aarch64-apple-darwin
       - name: darwin

azure-pipelines/pre-release.yml

@@ -32,12 +32,8 @@ extends:
         target: aarch64-unknown-linux-gnu
       - name: linux
         target: armv7-unknown-linux-gnueabihf
-      - name: linux
-        target: x86_64-unknown-linux-musl
       - name: linux
         target: aarch64-unknown-linux-gnu
-      - name: linux
-        target: x86_64-unknown-linux-musl
       - name: darwin
         target: aarch64-apple-darwin
       - name: darwin

azure-pipelines/stable.yml

@@ -30,12 +30,8 @@ extends:
         target: aarch64-unknown-linux-gnu
       - name: linux
         target: armv7-unknown-linux-gnueabihf
-      - name: linux
-        target: x86_64-unknown-linux-musl
       - name: linux
         target: aarch64-unknown-linux-gnu
-      - name: linux
-        target: x86_64-unknown-linux-musl
       - name: darwin
         target: aarch64-apple-darwin
       - name: darwin