[ci] enable curl build option

Enable on all platforms except
  - mac13: libcurl is built without the 'threadsafe' option, hence
disabling it there. Newer versions of macOS have that feature enabled.
  - Ubuntu 22: libcurl version too old (7.81 vs. 7.84)

Author: jblomer

.github/workflows/root-ci-config/buildconfig/global.txt

@@ -2,6 +2,7 @@ builtin_cppzmq=ON
 builtin_zeromq=ON
 ccache=ON
 check_connection=OFF
+curl=ON
 fail-on-missing=ON
 fftw3=ON
 fitsio=ON

.github/workflows/root-ci-config/buildconfig/mac13.txt

@@ -26,6 +26,7 @@ builtin_xxhash=ON
 builtin_zeromq=ON
 builtin_zstd=ON
 cocoa=ON
+curl=OFF
 fortran=OFF
 minuit2_omp=OFF
 tmva-sofie=ON

.github/workflows/root-ci-config/buildconfig/ubuntu22.txt

@@ -1,5 +1,6 @@
 builtin_unuran=ON
 builtin_vdt=ON
+curl=OFF
 r=ON
 test_distrdf_dask=OFF
 test_distrdf_pyspark=OFF