Bump getdeps patchelf from 0.10 to 0.18.0; remove pip workaround

Summary:
- Updates `build/fbcode_builder/manifests/patchelf` from 0.10 → 0.18.0
- Removes the `pip install patchelf>=0.18` workaround from `tools/wheels/build_linux_sdk.sh`

## Root cause

`packaging_linux` was failing with:

```
OSError: /usr/local/lib/librebalancer.so: ELF load command address/offset not page-aligned
```

`fixup-dyn-deps` builds and uses **its own patchelf binary** from the getdeps manifest — it hard-codes the absolute path to its own build in `/tmp/fbcode_builder_getdeps-.../installed/patchelf-.../bin/patchelf` and never consults PATH. The manifest was pinned to patchelf 0.10, which corrupts ELF segment alignment when rewriting RPATH on large shared libs. The dynamic loader (`dlopen`) is stricter than the static linker, so the corruption passed the link test but failed at runtime.

The previous attempt to fix this (`pip install patchelf>=0.18` in `build_linux_sdk.sh`) only affected the explicit `patchelf` calls in the bash script, not the getdeps-internal binary. Updating the manifest is the correct fix.

X-link: facebookincubator/rebalancer#1

Reviewed By: sahilsd

Differential Revision: D108232802

Pulled By: r-barnes

fbshipit-source-id: 38984c1eac0c19f01ea1f7dfd2e556967db6c27a

Author: r-barnes

build/fbcode_builder/manifests/patchelf

@@ -11,10 +11,9 @@ patchelf
 patchelf
 
 [download]
-url = https://github.com/NixOS/patchelf/archive/0.10.tar.gz
-sha256 = b3cb6bdedcef5607ce34a350cf0b182eb979f8f7bc31eae55a93a70a3f020d13
+url = https://github.com/NixOS/patchelf/archive/0.18.0.tar.gz
+sha256 = 1451d01ee3a21100340aed867d0b799f46f0b1749680028d38c3f5d0128fb8a7
 
 [build]
 builder = autoconf
-subdir = patchelf-0.10
-
+subdir = patchelf-0.18.0