[PATCH] elf.c: initialize st_mode member

From: Mingli Yu Initialize st_mode member to fix the below build failure when -Og included in compiler flag. | ./../../../../../../../../work-shared/gcc-8.3.0-r0/gcc-8.3.0/libsanitizer/libbacktrace/../../libbacktrace/elf.c: In function 'elf_is_symlink': | ../../../../../../../../../work-shared

[PATCH v2] elf.c: initialize struct stat

From: Mingli Yu Initialize struct stat to fix the below build failure when -Og included in compiler flag. | ./../../../../../../../../work-shared/gcc-8.3.0-r0/gcc-8.3.0/libsanitizer/libbacktrace/../../libbacktrace/elf.c: In function 'elf_is_symlink': | ../../../../../../../../../work-shared/gc