autotools: detect and link brotlicommon library for brotli

`brotlicommon` is necessary when linking brotli statically.
E.g. on Alpine Linux with `PKG_CONFIG='pkg-config --static'`.

It also syncs brotli libs listed in `libcurl.pc` and `curl-config` with
those generated by cmake, which already listed `brotlicommon` there.

Also:
- remove workaround from GHA/configure-vs-cmake CI jobs.

Ref: 69cda1b704
Follow-up to f2adb3b6d7 #15431
Reported-by: Christopher Boyd
Fixes #17678
Closes #17723

.github/workflows/configure-vs-cmake.yml

@@ -44,10 +44,10 @@ jobs:
         run: |
           autoreconf -fi
           export PKG_CONFIG_DEBUG_SPEW=1
-          mkdir bld-am && cd bld-am && ../configure --enable-static=no --with-openssl --without-libpsl --without-brotli
+          mkdir bld-am && cd bld-am && ../configure --enable-static=no --with-openssl --without-libpsl
 
       - name: 'run cmake'
-        run: cmake -B bld-cm -DCURL_WERROR=ON -DCURL_USE_LIBPSL=OFF -DCURL_BROTLI=OFF
+        run: cmake -B bld-cm -DCURL_WERROR=ON -DCURL_USE_LIBPSL=OFF
 
       - name: 'configure log'
         run: cat bld-am/config.log 2>/dev/null || true
@@ -90,13 +90,12 @@ jobs:
         run: |
           autoreconf -fi
           export PKG_CONFIG_DEBUG_SPEW=1
-          mkdir bld-am && cd bld-am && ../configure --enable-static=no --with-openssl --without-libpsl --disable-ldap --with-zstd
+          mkdir bld-am && cd bld-am && ../configure --enable-static=no --with-openssl --without-libpsl --disable-ldap --with-brotli --with-zstd
 
       - name: 'run cmake'
         run: |
           cmake -B bld-cm -DCURL_WERROR=ON -DCURL_USE_LIBPSL=OFF -DCURL_DISABLE_LDAP=ON \
             -DCMAKE_C_COMPILER_TARGET="$(uname -m | sed 's/arm64/aarch64/')-apple-darwin$(uname -r)" \
-            -DCURL_BROTLI=OFF \
             -DCURL_USE_LIBSSH2=OFF
 
       - name: 'configure log'