Ports: Remove build-crt patch from llvm

This patch has been integrated into the toolchain.patch file.

Ports/llvm/patches/ReadMe.md

@@ -1,15 +1,5 @@
 # Patches for LLVM on SerenityOS
 
-## `build-crt.patch`
-
-This patch lets us use LLVM's `crtbegin.o`/`crtend.o` implementation.
-
-### Status
-- [ ] Local?
-- [x] Should be merged to upstream?
-- [ ] Resolves issue(s) with our side of things
-- [ ] Hack
-
 ## `insert-ifdef-serenity.patch`
 
 This patch adds several defines in order to omit things not supported by SerenityOS.

Ports/llvm/patches/build-crt.patch

@@ -1,13 +0,0 @@
-diff --git a/compiler-rt/cmake/config-ix.cmake b/compiler-rt/cmake/config-ix.cmake
-index 39b9120f0..1a49ac3e5 100644
---- a/compiler-rt/cmake/config-ix.cmake
-+++ b/compiler-rt/cmake/config-ix.cmake
-@@ -684,7 +684,7 @@ endif()
- 
- # TODO: Add builtins support.
- 
--if (CRT_SUPPORTED_ARCH AND OS_NAME MATCHES "Linux" AND NOT LLVM_USE_SANITIZER)
-+if (CRT_SUPPORTED_ARCH AND OS_NAME MATCHES "Linux|SerenityOS" AND NOT LLVM_USE_SANITIZER)
-   set(COMPILER_RT_HAS_CRT TRUE)
- else()
-   set(COMPILER_RT_HAS_CRT FALSE)