GHA: disable autotools static libcurl in many jobs

To avoid building libcurl in both static and shared flavor by default.
It results in 1.5-2.x speed-up for the curl build step in most jobs.
Saving a total of 6-7 minutes. In the Cygwin job alone it saves 1-1.5m.

Also:
- enable static + shared in a Windows job to keep testing this combo.

Follow-up to ff958fc4b2 #20159

Closes #20167

.github/workflows/linux-old.yml

@@ -162,7 +162,7 @@ jobs:
         run: |
           mkdir bld-am
           cd bld-am
-          ../configure --disable-dependency-tracking --enable-unity --enable-warnings --enable-werror \
+          ../configure --disable-dependency-tracking --enable-unity --enable-warnings --enable-werror --disable-shared \
             --without-ssl --enable-ares --without-libssh2 --with-zstd --with-gssapi --with-librtmp \
             --prefix="$PWD"/../curl-install-am