extra/rust: Make work on systems with larger pages (1.59.0-1.1)

jemalloc is broken by default on architectures like aarch64, where the
page size is not a constant (it requires compile-time page size >=
run-time page size). Force it to build for 64K pages, which should work
for all possible ARM systems.

extra/rust/PKGBUILD

@@ -17,7 +17,7 @@ pkgbase=rust
 pkgname=(rust rust-src)
 epoch=1
 pkgver=1.59.0
-pkgrel=1
+pkgrel=1.1
 pkgdesc="Systems programming language focused on safety, speed and concurrency"
 url=https://www.rust-lang.org/
 arch=(x86_64)
@@ -139,6 +139,7 @@ _pick() {
 build() {
   cd rustc-$pkgver-src
 
+  export JEMALLOC_SYS_WITH_LG_PAGE=16
   export RUST_BACKTRACE=1
   export RUST_COMPILER_RT_ROOT="$srcdir/compiler-rt-$_llvm_ver.src"
   [[ -d $RUST_COMPILER_RT_ROOT ]]