Add new include search path folder for no-cmake build because of upstream AWS-LC change #2324 (#792)

aws/aws-lc#2324 implements a new import method for s2n-bignum upstream in AWS-LC. Among other things it introduces a new folder structure. This messes with assumptions for the aws-lc-rs prefix build, when not using cmake. aws-lc-rs has hard assumptions on the folder structure to add the correct include search paths.

Now s2n-bignum source in upstream AWS-LC is located under third_party/s2n-bignum/s2n-bignum-imported. Note third_party/s2-bignum contains the AWS-LC-specific header files. Hence we keep the existing search path.

Author: torben-hansen

aws-lc-sys/builder/cc_builder.rs

@@ -302,6 +302,14 @@ impl CcBuilder {
                 .join("s2n-bignum")
                 .join("include"),
         ));
+        build_options.push(BuildOption::include(
+            self.manifest_dir
+                .join("aws-lc")
+                .join("third_party")
+                .join("s2n-bignum")
+                .join("s2n-bignum-imported")
+                .join("include"),
+        ));
         build_options.push(BuildOption::include(
             self.manifest_dir
                 .join("aws-lc")