[LLD][ELF] - Update tests after yaml2obj tool update.

yaml2obj doesn't create .symtab by default anymore.


git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@375360 91177308-0d34-0410-b5e6-96231b3b80d8

test/ELF/invalid/bad-reloc-target.test

@@ -68,7 +68,6 @@ Sections:
     Flags:       [ SHF_ALLOC, SHF_EXECINSTR ]
   - Name:        .rela.text
     Type:        SHT_RELA
-    Link:        .symtab
     Info:        .text
     Relocations:
       - Offset:  0x0000000000000000

test/ELF/invalid/sht-group.test

@@ -12,7 +12,6 @@ FileHeader:
 Sections:
   - Name:              .group
     Type:              SHT_GROUP
-    Link:              .symtab
     Info:              12345
     Members:
       - SectionOrType: GRP_COMDAT