🐛 Allow empty prefix in undefined symbols lines

This should allow parsing strings like

```
compile-time-init-build/build/test/log/CMakeFiles/catalog2_lib.dir/catalog2a_lib.cpp.o:
__Unwind_Resume
unsigned int module<sc::module_string<sc::undefined<void, char, (char)100, (char)101, (char)102, (char)97, (char)117, (char)108, (char)116>>>()
unsigned int catalog<sc::message<(logging::level)7, sc::undefined<sc::args<int, int>, char, (char)68, (char)32, (char)115, (char)116, (char)114, (char)105, (char)110, (char)103, (char)32, (char)119, (char)105, (char)116, (char)104, (char)32, (char)123, (char)125, (char)32, (char)97, (char)110, (char)100, (char)32, (char)123, (char)125, (char)32, (char)112, (char)108, (char)97, (char)99, (char)101, (char)104, (char)111, (char)108, (char)100, (char)101, (char)114>>>()
std::terminate()
___cxa_begin_catch
___gxx_personality_v0
___stack_chk_fail
___stack_chk_guard
_log_calls

compile-time-init-build/build/test/log/CMakeFiles/catalog2_lib.dir/catalog2b_lib.cpp.o:
__Unwind_Resume
unsigned int module<sc::module_string<sc::undefined<void, char, (char)100, (char)101, (char)102, (char)97, (char)117, (char)108, (char)116>>>()
unsigned int catalog<sc::message<(logging::level)7, sc::undefined<sc::args<ns::E>, char, (char)69, (char)32, (char)115, (char)116, (char)114, (char)105, (char)110, (char)103, (char)32, (char)119, (char)105, (char)116, (char)104, (char)32, (char)123, (char)125, (char)32, (char)112, (char)108, (char)97, (char)99, (char)101, (char)104, (char)111, (char)108, (char)100, (char)101, (char)114>>>()
std::terminate()
___cxa_begin_catch
___gxx_personality_v0
___stack_chk_fail
___stack_chk_guard
_log_calls
```

Signed-off-by: Michael Krasnyk <[email protected]>

Author: oxidase

tools/gen_str_catalog.py

@@ -93,7 +93,7 @@ def stable_module_key(module: str):
 
 
 def read_input(filenames: list[str], stable_ids):
-    line_re = re.compile(r"^.+?(unsigned int (catalog|module)<(.+?)>\(\))$")
+    line_re = re.compile(r"^.*(unsigned int (catalog|module)<(.+?)>\(\))$")
 
     def read_file(filename):
         with open(filename, "r") as f: