Build rust bindings against header files under current source dir
Without this, it was using the headers from /usr/include, and on my
machine it failed with the following:
```
$ cmake .. -DRUST_BINDINGS=$(gcc -dumpmachine) && make
/boringssl/rust/rust_wrapper.c: In function
‘ERR_GET_FUNC_RUST’:
/usr/local/google/home/yukl/boringssl/rust/rust_wrapper.c:27:10: error:
implicit declaration of function ‘ERR_GET_FUNC’; did you mean
‘ERR_GET_LIB’? [-Werror=implicit-function-declaration]
27 | return ERR_GET_FUNC(packed_error);
| ^~~~~~~~~~~~
| ERR_GET_LIB
```
Change-Id: Ia34830c939f32a8807e1c8be03d962c21dfc1635
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/55932
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: Matthew Maurer <mmaurer@google.com>
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/rust/CMakeLists.txt b/rust/CMakeLists.txt
index f60ad47..9bdec3e 100644
--- a/rust/CMakeLists.txt
+++ b/rust/CMakeLists.txt
@@ -1,4 +1,5 @@
# additional interop for things like macros and inlined functions
+include_directories(${CMAKE_CURRENT_SOURCE_DIR}/../include)
add_library(
rust_wrapper
STATIC
