src/tls13.c: in DoTls13ServerHello() WOLFSSL_ASYNC_CRYPT path, fix -Wdeclaration-after-statement caused by fallthrough definition;

.github/workflows: update async.yml, multi-arch.yml, multi-compiler.yml, no-malloc.yml, opensslcoexist.yml, and os-check.yml, with -pedantic and related flags, and add --enable-riscv-asm to multi-arch.yml RISC-V scenario;

configure.ac: clarify error message for "SP ASM not available for CPU."

.github/workflows/multi-compiler.yml

@@ -55,7 +55,7 @@ jobs:
         env:
             CC: ${{ matrix.CC }}
             CXX: ${{ matrix.CXX }}
-        run: ./autogen.sh && ./configure && make && make dist
+        run: ./autogen.sh && ./configure CFLAGS="-pedantic -Wdeclaration-after-statement" && make && make dist
       - name: Show log on errors
         if: ${{ failure() }}
         run: |