fix missing mimalloc in shim

Summary:
X-link: facebook/buck2#962

`mimalloc` was added as a dependency to buck2 in D73602674. But wasn't added to the shim, so OSS build fails.

Reviewed By: IanChilds

Differential Revision: D75002030

fbshipit-source-id: e026b9778c391495d9e1fc7c69b2f407bc8b243d

Author: samkevich

shim/third-party/rust/Cargo.toml

@@ -119,6 +119,7 @@ lalrpop = { version = "0.19.7", artifact = "bin", features = ["pico-args"] }
 lalrpop-util = "0.19.7"
 libc = "0.2.158"
 libfuzzer-sys = "0.4"
+libmimalloc-sys = "0.1.42"
 linked-hash-map = { version = "0.5", features = ["serde_impl"] }
 linkme = { version = "0.3.17", features = ["used_linker"] }
 log = "0.4"
@@ -132,6 +133,7 @@ md-5 = "0.10"
 memchr = "2.4.1"
 memmap2 = "0.5.0"
 memoffset = "0.6.4"
+mimalloc = { version = "0.1.46", default-features = false }
 multimap = "0.8.2"
 nix = { version = "0.29.0", features = ["dir", "event", "hostname", "inotify", "ioctl", "mman", "mount", "net", "poll", "ptrace", "reboot", "resource", "sched", "signal", "term", "time", "user", "zerocopy"] }
 nom = "7.1.3"

shim/third-party/rust/fixups/libmimalloc-sys/fixups.toml

@@ -0,0 +1,34 @@
+buildscript.run = false
+
+[[cxx_library]]
+name = "libmimalloc"
+add_dep = true
+srcs = [
+    "c_src/mimalloc/src/alloc.c",
+    "c_src/mimalloc/src/alloc-aligned.c",
+    "c_src/mimalloc/src/alloc-posix.c",
+    "c_src/mimalloc/src/arena.c",
+    "c_src/mimalloc/src/bitmap.c",
+    "c_src/mimalloc/src/heap.c",
+    "c_src/mimalloc/src/init.c",
+    "c_src/mimalloc/src/libc.c",
+    "c_src/mimalloc/src/options.c",
+    "c_src/mimalloc/src/os.c",
+    "c_src/mimalloc/src/page.c",
+    "c_src/mimalloc/src/prim/prim.c",
+    "c_src/mimalloc/src/random.c",
+    "c_src/mimalloc/src/segment-map.c",
+    "c_src/mimalloc/src/segment.c",
+    "c_src/mimalloc/src/stats.c",
+]
+headers = [
+    "c_src/mimalloc/include/**/*.h",
+    "c_src/mimalloc/src/alloc-override.c",
+    "c_src/mimalloc/src/arena-abandon.c",
+    "c_src/mimalloc/src/bitmap.h",
+    "c_src/mimalloc/src/free.c",
+    "c_src/mimalloc/src/page-queue.c",
+    "c_src/mimalloc/src/prim/**/*.c",
+]
+exported_headers = []
+include_paths = ["c_src/mimalloc/include"]