Use malloc_usable_size() on FreeBSD (servo#707)

Per jemalloc(3), the non-POSIX APIs are declared in the header
malloc_np.h

Testing: With this change, I've successfully built mozjs-sys on FreeBSD.
Without it, the build fails.

Signed-off-by: Juhani Krekelä <juhani@krekelä.fi>
Co-authored-by: Juhani Krekelä <juhani@krekelä.fi>

Author: nortti0

mozjs-sys/Cargo.toml

@@ -2,7 +2,7 @@
 name = "mozjs_sys"
 description = "System crate for the Mozilla SpiderMonkey JavaScript engine."
 repository.workspace = true
-version = "0.140.7-1"
+version = "0.140.7-2"
 authors = ["Mozilla", "The Servo Project Developers"]
 links = "mozjs"
 license.workspace = true

mozjs-sys/src/jsglue.cpp

@@ -934,6 +934,8 @@ void DeleteRootedObjectVector(JS::PersistentRootedObjectVector* v) { delete v; }
 
 #if defined(__linux__) || defined(__wasi__)
 #  include <malloc.h>
+#elif defined(__FreeBSD__)
+#  include <malloc_np.h>
 #elif defined(__APPLE__)
 #  include <malloc/malloc.h>
 #elif defined(__MINGW32__) || defined(__MINGW64__)
@@ -946,7 +948,7 @@ void DeleteRootedObjectVector(JS::PersistentRootedObjectVector* v) { delete v; }
 
 // SpiderMonkey-in-Rust currently uses system malloc, not jemalloc.
 static size_t MallocSizeOf(const void* aPtr) {
-#if defined(__linux__) || defined(__wasi__)
+#if defined(__linux__) || defined(__wasi__) || defined(__FreeBSD__)
   return malloc_usable_size((void*)aPtr);
 #elif defined(__APPLE__)
   return malloc_size((void*)aPtr);

mozjs/Cargo.toml

@@ -2,7 +2,7 @@
 name = "mozjs"
 description = "Rust bindings to the Mozilla SpiderMonkey JavaScript engine."
 repository.workspace = true
-version = "0.15.3"
+version = "0.15.4"
 authors = ["The Servo Project Developers"]
 license.workspace = true
 edition.workspace = true
@@ -27,7 +27,7 @@ encoding_rs = "0.8.35"
 libc.workspace = true
 log = "0.4"
 # When doing non-version changes also update ../mozjs-sys/etc/sm-security-bump.py
-mozjs_sys = { version = "=0.140.7-1", path = "../mozjs-sys" }
+mozjs_sys = { version = "=0.140.7-2", path = "../mozjs-sys" }
 num-traits = "0.2"
 
 [target.'cfg(target_arch = "wasm32")'.dev-dependencies]