Fix symlink path for libgcc

The symlink for libgcc_so.1.0 is made to point to libunwind.so
which is functionally correct but it fails some linux distro packaging
complain because libunwind.so is made part of -dev package but
libgcc_so.1.0 ends up in the real package, and creates an unneeded
package -> dev dependency

create the symlink to point to libunwind.so.1 instead then the boundaries
of packaging are not crossed and all is well.

Author: kraj

llvm-libgcc/CMakeLists.txt

@@ -137,7 +137,7 @@ add_custom_target(llvm-libgcc ALL
   DEPENDS unwind_shared unwind_static clang_rt.builtins-${COMPILER_RT_DEFAULT_TARGET_ARCH}
   COMMAND ${CMAKE_COMMAND} -E create_symlink ${LLVM_LIBGCC_COMPILER_RT} libgcc.a
   COMMAND ${CMAKE_COMMAND} -E create_symlink libunwind.a libgcc_eh.a
-  COMMAND ${CMAKE_COMMAND} -E create_symlink libunwind.so libgcc_s.so.1.0
+  COMMAND ${CMAKE_COMMAND} -E create_symlink libunwind.so.1 libgcc_s.so.1.0
   COMMAND ${CMAKE_COMMAND} -E create_symlink libgcc_s.so.1.0 libgcc_s.so.1
   COMMAND ${CMAKE_COMMAND} -E create_symlink libgcc_s.so.1 libgcc_s.so
 )