Ensure crate is compiled with std for panic handler

This CL adds a patch to use `extern crate std` to ensure that a panic
handler is available when the crate is compiled as a dylib.

Test: m libpercent_encoding
Bug: 333887339
Change-Id: I38f91e3b99f483b0f248ac95ba1f6aaaa64762d0

2 files changed, 17 insertions, 0 deletions

diff --git a/patches/std.diff b/patches/std.diff
new file mode 100644
index 0000000..76feb4e
--- /dev/null
+++ b/patches/std.diff
@@ -0,0 +1,14 @@
+diff --git a/src/lib.rs b/src/lib.rs
+index 46a5d74..21d8a61 100644
+--- a/src/lib.rs
++++ b/src/lib.rs
+@@ -41,6 +41,9 @@
+ #[cfg(feature = "alloc")]
+ extern crate alloc;
+ 
++#[cfg(android_dylib)]
++extern crate std;
++
+ #[cfg(feature = "alloc")]
+ use alloc::{
+     borrow::{Cow, ToOwned},
diff --git a/src/lib.rs b/src/lib.rs
index 46a5d74..21d8a61 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -41,6 +41,9 @@
 #[cfg(feature = "alloc")]
 extern crate alloc;
 
+#[cfg(android_dylib)]
+extern crate std;
+
 #[cfg(feature = "alloc")]
 use alloc::{
     borrow::{Cow, ToOwned},