[Driver] Fix -r handling on Solaris (#70322)

As discussed in [[Driver] Link Flang runtime on Solaris](https://github.com/llvm/llvm-project/pull/65644), `clang -r`
incorrectly passes both `-Bdynamic` and `-e _start` to `ld` which lets the linker choke.

This patch fixes this, omitting `-Bdynamic` completely which is the linker default.

Tested on `amd64-pc-solaris2.11` and `sparcv9-sun-solaris2.11`.
diff --git a/clang/test/Driver/solaris-ld.c b/clang/test/Driver/solaris-ld.c
index 09e6e8b..8f7f168 100644
--- a/clang/test/Driver/solaris-ld.c
+++ b/clang/test/Driver/solaris-ld.c
@@ -177,6 +177,7 @@
 // RUN:   | FileCheck %s --check-prefix=CHECK-RELOCATABLE
 // CHECK-RELOCATABLE:     "-L
 // CHECK-RELOCATABLE:     "-r"
+// CHECK-RELOCATABLE-NOT: "-e"
 // CHECK-RELOCATABLE-NOT: "-l
 // CHECK-RELOCATABLE-NOT: /crt{{[^.]+}}.o
 // CHECK-RELOCATABLE-NOT: /values-{{[^.]+}}.o