vendor/botan: Remove

This is infrequently maintained, and has been a strict subset of what is
available in `core:crypto` for a while.  Instead of improving the
bindings, it is better to spend resources improving `core:crypto`.

.github/workflows/ci.yml

@@ -7,8 +7,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
-      - name: Download LLVM, botan
-        run: sudo apt-get install llvm-11 clang-11 libbotan-2-dev botan
+      - name: Download LLVM
+        run: sudo apt-get install llvm-11 clang-11
       - name: build odin
         run: ./build_odin.sh release
       - name: Odin version
@@ -61,9 +61,9 @@ jobs:
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v1
-      - name: Download LLVM, botan and setup PATH
+      - name: Download LLVM, and setup PATH
         run: |
-          brew install llvm@13 botan
+          brew install llvm@13
           echo "/usr/local/opt/llvm@13/bin" >> $GITHUB_PATH
           TMP_PATH=$(xcrun --show-sdk-path)/user/include
           echo "CPATH=$TMP_PATH" >> $GITHUB_ENV
@@ -102,9 +102,9 @@ jobs:
     runs-on: macos-14 # This is an arm/m1 runner.
     steps:
       - uses: actions/checkout@v1
-      - name: Download LLVM, botan and setup PATH
+      - name: Download LLVM and setup PATH
         run: |
-          brew install llvm@13 botan
+          brew install llvm@13
           echo "/opt/homebrew/opt/llvm@13/bin" >> $GITHUB_PATH
           TMP_PATH=$(xcrun --show-sdk-path)/user/include
           echo "CPATH=$TMP_PATH" >> $GITHUB_ENV