configure: fix and complete detection of tricore tools

The tricore tools are not detected when they are installed in
the host system, only if they are taken from an external
container.  For this reason the build-tricore-softmmu job
was not running the TCG tests.

In addition the container provides all tools, not just as/ld/gcc,
so there is no need to special case tricore.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure

@@ -1271,6 +1271,7 @@ fi
 : ${cross_prefix_sh4="sh4-linux-gnu-"}
 : ${cross_prefix_sparc64="sparc64-linux-gnu-"}
 : ${cross_prefix_sparc="$cross_prefix_sparc64"}
+: ${cross_prefix_tricore="tricore-"}
 : ${cross_prefix_x86_64="x86_64-linux-gnu-"}
 
 : ${cross_cc_aarch64_be="$cross_cc_aarch64"}
@@ -1458,10 +1459,6 @@ probe_target_compiler() {
       tricore)
         container_image=debian-tricore-cross
         container_cross_prefix=tricore-
-        container_cross_as=tricore-as
-        container_cross_ld=tricore-ld
-        container_cross_cc=tricore-gcc
-        break
         ;;
       x86_64)
         container_image=debian-amd64-cross