preset: build with no assertion for swiftpm on linux (#81217)

To work around #81144, build
the Swift PM linux pseudo-toolchain without assertion

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Author: bkhouri

utils/build-presets.ini

@@ -1945,7 +1945,9 @@ mixin-preset=mixin_swiftpm_linux_platform
 
 # Build Release without debug info, because it is faster to build.
 release
+# work around https://github.com/swiftlang/swift/issues/81144
 assertions
+no-swift-stdlib-assertions
 
 # Downstream projects that import llbuild+SwiftPM.
 sourcekit-lsp
@@ -1957,6 +1959,7 @@ skip-test-toolchain-benchmarks
 
 skip-test-llbuild
 
+
 #===------------------------------------------------------------------------===#
 # Test llbuild on macOS builder
 #===------------------------------------------------------------------------===#