increase parallelism with --enable-icecream from 10 to 40

My 5-year-old desktop can build 8 jobs on its own, so 10 is a rather
pointless default nowadays. Icecream will spawn only as many jobs
as the cluster can handle, so this should work fine even for small
machines/clusters.

Change-Id: Iccdf3adf51f55428e89e042d83979a1e1327659e
Reviewed-on: https://gerrit.libreoffice.org/75029
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>
diff --git a/configure.ac b/configure.ac
index 2f1f242..ba07975 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2217,7 +2217,7 @@ AC_ARG_WITH(parallelism,
        [Number of jobs to run simultaneously during build. Parallel builds can
        save a lot of time on multi-cpu machines. Defaults to the number of
        CPUs on the machine, unless you configure --enable-icecream - then to
        10.]),
        40.]),
,)

AC_ARG_WITH(all-tarballs,
@@ -12409,7 +12409,7 @@ if test -n "$with_parallelism" -a "$with_parallelism" != "yes"; then
    fi
else
    if test "$enable_icecream" = "yes"; then
        PARALLELISM="10"
        PARALLELISM="40"
    else
        case `uname -s` in