Fix build with FEATURE_GDBJIT enabled

[0xfk0]

This commit fixes broken build in case when following arguments added to
build.sh script: --cmakeargs -DFEATURE_GDBJIT=true

@alpencolt, @jkotas

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[0xfk0]

Without this fix following error occurs:

  In file included from /home/sysop/dotnet-runtime/src/coreclr/src/vm/ceemain.cpp:119:
  In file included from /home/sysop/dotnet-runtime/src/coreclr/src/vm/crossgen/../common.h:97:
  In file included from /home/sysop/dotnet-runtime/src/coreclr/src/inc/stdmacros.h:22:
  In file included from /home/sysop/dotnet-runtime/src/coreclr/src/inc/contract.h:254:
  In file included from /home/sysop/dotnet-runtime/src/coreclr/src/inc/check.h:725:
  In file included from /home/sysop/dotnet-runtime/src/coreclr/src/inc/check.inl:9:
  In file included from /home/sysop/dotnet-runtime/src/coreclr/src/inc/clrhost.h:19:
  /home/sysop/dotnet-runtime/src/coreclr/src/inc/holder.h:1016:5: error: deleting pointer to incomplete type 'Elf_Symbol' may cause undefined behavior [-Werror,-Wdelete-incomplete]
      delete [] value;
      ^         ~~~~~
  /home/sysop/dotnet-runtime/src/coreclr/src/inc/holder.h:1021:50: note: in instantiation of function template specialization 'DeleteArray<Elf_Symbol>' requested here
  using NewArrayHolder = SpecializedWrapper<_TYPE, DeleteArray<_TYPE>>;
                                                   ^
  /home/sysop/dotnet-runtime/src/coreclr/src/vm/crossgen/../gdbjit.h:337:8: note: forward declaration of 'Elf_Symbol'
  struct Elf_Symbol;
         ^
  1 error generated.
  Stripping symbols from $<TARGET_FILE:clrjit> into file $<TARGET_FILE:clrjit>.dbg
  src/vm/crossgen/CMakeFiles/cee_crossgen.dir/build.make:179: recipe for target 'src/vm/crossgen/CMakeFiles/cee_crossgen.dir/__/ceemain.cpp.o' failed
  make[2]: *** [src/vm/crossgen/CMakeFiles/cee_crossgen.dir/__/ceemain.cpp.o] Error 1
  CMakeFiles/Makefile2:4291: recipe for target 'src/vm/crossgen/CMakeFiles/cee_crossgen.dir/all' failed
  make[1]: *** [src/vm/crossgen/CMakeFiles/cee_crossgen.dir/all] Error 2
  make[1]: *** Waiting for unfinished jobs....
  In file included from /home/sysop/dotnet-runtime/src/coreclr/src/vm/prestub.cpp:14:
  In file included from /home/sysop/dotnet-runtime/src/coreclr/src/vm/common.h:97:
  In file included from /home/sysop/dotnet-runtime/src/coreclr/src/inc/stdmacros.h:22:
  In file included from /home/sysop/dotnet-runtime/src/coreclr/src/inc/contract.h:254:
  In file included from /home/sysop/dotnet-runtime/src/coreclr/src/inc/check.h:725:
  In file included from /home/sysop/dotnet-runtime/src/coreclr/src/inc/check.inl:9:
  In file included from /home/sysop/dotnet-runtime/src/coreclr/src/inc/clrhost.h:19:
  /home/sysop/dotnet-runtime/src/coreclr/src/inc/holder.h:1016:5: error: deleting pointer to incomplete type 'Elf_Symbol' may cause undefined behavior [-Werror,-Wdelete-incomplete]
      delete [] value;
      ^         ~~~~~
  /home/sysop/dotnet-runtime/src/coreclr/src/inc/holder.h:1021:50: note: in instantiation of function template specialization 'DeleteArray<Elf_Symbol>' requested here
  using NewArrayHolder = SpecializedWrapper<_TYPE, DeleteArray<_TYPE>>;
                                                   ^
  /home/sysop/dotnet-runtime/src/coreclr/src/vm/gdbjit.h:337:8: note: forward declaration of 'Elf_Symbol'
  struct Elf_Symbol;
         ^
  1 error generated.

[jkotas]

Thanks