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Build crtbegin.o/crtend.o from source code
Build crtbengin.o/crtend.o from source code instead of copying from gcc.
The crtbegin and crtend implementation from llvm don't need `crtbeginS.o` for PIC. `crtbegin{,S,T}.o` is unified into one generic `crtbegin.o`. See the comments in https://reviews.llvm.org/D28791#1419436 and https://reviews.llvm.org/D28791#1420914
fix: https://github.com/rust-lang/rust/issues/85310 , fix: https://github.com/rust-lang/rust/issues/47551 , fix: https://github.com/rust-lang/rust/issues/84033