[RISCV] Shorten diagnostic a bit.

The "to be enabled" seemed unnecessary.

Author: topperc

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -12002,7 +12002,7 @@ def warn_tcb_enforcement_violation : Warning<
 
 // RISC-V builtin required extension warning
 def err_riscv_builtin_requires_extension : Error<
-  "builtin requires%select{| at least one of the following extensions to be enabled}0: %1">;
+  "builtin requires%select{| at least one of the following extensions}0: %1">;
 def err_riscv_builtin_invalid_lmul : Error<
   "LMUL argument must be in the range [0,3] or [5,7]">;
 def err_riscv_type_requires_extension : Error<

clang/test/CodeGen/RISCV/rvv-intrinsics-handcrafted/rvv-error.c

@@ -11,7 +11,7 @@
 // CHECK-RV64V-NEXT:    ret i32 [[CONV]]
 //
 
-// CHECK-RV64-ERR: error: builtin requires at least one of the following extensions to be enabled: 'Zve32x'
+// CHECK-RV64-ERR: error: builtin requires at least one of the following extensions: 'Zve32x'
 
 int test() {
   return __builtin_rvv_vsetvli(1, 0, 0);