switch to zip files for llvm bitcode libraries

....impl/src/com/oracle/truffle/r/ffi/impl/llvm/LLVM_IR.java

...l/src/com/oracle/truffle/r/ffi/impl/llvm/MachOAccess.java

...src/com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_C.java

.../com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_Call.java

...c/com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_DLL.java

...m/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_PkgInit.java

...com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_Stats.java

.../com/oracle/truffle/r/ffi/impl/llvm/tools/ShowLLVMIR.java

...com/oracle/truffle/r/ffi/impl/nfi/TruffleNFI_CAccess.java

com.oracle.truffle.r.native/fficall/Makefile

com.oracle.truffle.r.native/fficall/src/caccess/Makefile

com.oracle.truffle.r.native/fficall/src/common/Makefile

...e.truffle.r.native/fficall/src/truffle_common/appl_rffi.c

...cle.truffle.r.native/fficall/src/truffle_common/caccess.c

...truffle.r.native/fficall/src/truffle_common/lapack_rffi.c

...e.truffle.r.native/fficall/src/truffle_common/misc_rffi.c

...oracle.truffle.r.native/fficall/src/truffle_llvm/Makefile

...racle.truffle.r.native/fficall/src/truffle_llvm/caccess.c

com.oracle.truffle.r.native/fficall/src/truffle_nfi/Makefile

com.oracle.truffle.r.native/gnur/Makefile.gnur