Crashlog: Unix: Use dladdr1 for symbol offset for addr2line

Subtract 1 from offset given to addr2line

cmake/FindDL.cmake

@@ -10,11 +10,27 @@ check_cxx_source_compiles("
     DL_FOUND
 )
 
+check_cxx_source_compiles("
+    #include <dlfcn.h>
+    #include <link.h>
+    int main() {
+        Dl_info info;
+        struct link_map *lm = nullptr;
+        return dladdr1(0, &info, (void **)&lm, RTLD_DL_LINKMAP);
+    }"
+    DL_FOUND2
+)
+
 if (DL_FOUND)
     add_compile_options(
         -DWITH_DL
     )
     link_libraries(dl)
+    if (DL_FOUND2)
+        add_compile_options(
+            -DWITH_DL2
+        )
+    endif (DL_FOUND2)
 endif (DL_FOUND)
 
 set(CMAKE_REQUIRED_LIBRARIES "")