cargo: additive panic-handler feature

This commit is a breaking change

Author: phip1611

uefi-services/Cargo.toml

@@ -21,6 +21,7 @@ cfg-if = "1.0.0"
 qemu-exit = { version = "3.0.1", optional = true }
 
 [features]
+default-features = ["panic_handler"]
 # Enable QEMU-specific functionality
 qemu = ["qemu-exit"]
-no_panic_handler = []
+panic_handler = []

uefi-services/src/lib.rs

@@ -130,7 +130,7 @@ unsafe extern "efiapi" fn exit_boot_services(_e: Event, _ctx: Option<NonNull<c_v
     uefi::alloc::exit_boot_services();
 }
 
-#[cfg(not(feature = "no_panic_handler"))]
+#[cfg(feature = "panic_handler")]
 #[panic_handler]
 fn panic_handler(info: &core::panic::PanicInfo) -> ! {
     error!("{}", info);