Fix building with non bazel commits of boringssl

We need to add `/build/crypto` and `/build/ssl` to the library search
path to handle the case where we pass `BORING_BSSL_SOURCE_PATH` when
building without enabling any fips features. Otherwise, non bazel
commits will not work because `/build/` itself will not contain any
crypto libraries to link with

boring-sys/build/main.rs

@@ -548,6 +548,16 @@ fn built_boring_source_path(config: &Config) -> &PathBuf {
                 "cargo:warning=skipping git patches application, provided\
                 native BoringSSL is expected to have the patches included"
             );
+        } else if config.env.source_path.is_some()
+            && (config.features.rpk
+                || config.features.pq_experimental
+                || config.features.underscore_wildcards)
+        {
+            panic!(
+                "BORING_BSSL_ASSUME_PATCHED must be set when setting
+                   BORING_BSSL_SOURCE_PATH and using any of the following
+                   features: rpk, pq-experimental, underscore-wildcards"
+            );
         } else {
             ensure_patches_applied(config).unwrap();
         }
@@ -620,17 +630,18 @@ fn main() {
     let bssl_dir = built_boring_source_path(&config);
     let build_path = get_boringssl_platform_output_path(&config);
 
+    println!(
+        "cargo:rustc-link-search=native={}/build/crypto/{}",
+        bssl_dir.display(),
+        build_path
+    );
+    println!(
+        "cargo:rustc-link-search=native={}/build/ssl/{}",
+        bssl_dir.display(),
+        build_path
+    );
+
     if config.features.fips || config.features.fips_link_precompiled {
-        println!(
-            "cargo:rustc-link-search=native={}/build/crypto/{}",
-            bssl_dir.display(),
-            build_path
-        );
-        println!(
-            "cargo:rustc-link-search=native={}/build/ssl/{}",
-            bssl_dir.display(),
-            build_path
-        );
         println!(
             "cargo:rustc-link-search=native={}/lib/{}",
             bssl_dir.display(),