meson: Enable link time optimization

Currently local boost subproject compilation fails with a message:
"""
../subprojects/boost-1.83.0/libs/container/src/dlmalloc_ext_2_8_6.c:
1085:41: error: iteration 2305843009213693951 invokes undefined
behavior [-Werror=aggressive-loop-optimizations]
 1085 |                size = request2size(sizes[i]*element_size);

...

cc1: all warnings being treated as errors
"""
To solve the issue enable link time optimization.

Change-Id: I12bb95189da3da9ff6287c6c6c69da896f287c61
Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
1 file changed