TeamCity: speed up ppc64le CI (#3622)

The builder is currently spending 15 to 20 minutes installing gcc and
upgrading packages every time we run the tests.
Because of this the build fails sometimes by running out of time.
This change reduces that to 5 minutes by:

* switching from curl to wget (which seems to have fewer dependencies)
* not installing gcc on ppc64le
* skipping tests that depend on gcc or other binutils

pkg/proc/proc_linux_test.go

@@ -14,7 +14,15 @@ import (
 	protest "github.com/go-delve/delve/pkg/proc/test"
 )
 
+func mustHaveObjcopy(t *testing.T) {
+	t.Helper()
+	if objcopyPath, _ := exec.LookPath("objcopy"); objcopyPath == "" {
+		t.Skip("no objcopy in path")
+	}
+}
+
 func TestLoadingExternalDebugInfo(t *testing.T) {
+	mustHaveObjcopy(t)
 	fixture := protest.BuildFixture("locationsprog", 0)
 	defer os.Remove(fixture.Path)
 	stripAndCopyDebugInfo(fixture, t)
@@ -26,6 +34,7 @@ func TestLoadingExternalDebugInfo(t *testing.T) {
 }
 
 func TestGnuDebuglink(t *testing.T) {
+	mustHaveObjcopy(t)
 	// build math.go and make a copy of the executable
 	fixture := protest.BuildFixture("math", 0)
 	buf, err := os.ReadFile(fixture.Path)