Leaked memory in `flecs::world`

[Evangel63]

Describe the bug Memory leak in ecs_pipeline_init, detected using Address Sanitizer

To Reproduce

#include "flecs.h"

int main()
{
    flecs::world ecs;
}

Compile with Address Sanitizer (exact compile command I used is g++-12 -std=c++20 ./flecs_asan_test.cpp ../co/flecs-build/flecs_gcc12.o -o ./flecs_asan_test -I../co/flecs/include -g -O0 -fsanitize=address for the above, gcc-12 ../flecs/flecs.c -I../flecs/include -o ./flecs_gcc12.o -c -g -std=gnu99 -O0 -fsanitize=address for flecs) and run. Produces the following

=================================================================
==1503784==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 72 byte(s) in 1 object(s) allocated from:
    #0 0x7fb4be1fb2d7 in __interceptor_calloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:77
    #1 0x55dd0582d02b in ecs_os_api_calloc ../flecs/flecs.c:46092
    #2 0x55dd057cd524 in ecs_pipeline_init ../flecs/flecs.c:16880
    #3 0x55dd057ce4b4 in FlecsPipelineImport ../flecs/flecs.c:16946
    #4 0x55dd057e317b in ecs_import ../flecs/flecs.c:24339
    #5 0x55dd057e3291 in ecs_import_c ../flecs/flecs.c:24363
    #6 0x55dd05815d82 in ecs_init ../flecs/flecs.c:39181
    #7 0x55dd0577192e in flecs::world::world() ../co/flecs/include/flecs/private/../addons/cpp/world.hpp:96
    #8 0x55dd05768d8d in main flecs_asan_test.cpp:6
    #9 0x7fb4bdc0cd8f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58

SUMMARY: AddressSanitizer: 72 byte(s) leaked in 1 allocation(s).

Expected behavior No memory leak.

Additional context Ubuntu 22.04, gcc/g++ 12.1. Also appears using valgrind --leak-check=full.

[SanderMertens]

Fixed!