Compile failure due to unconditional use of if-defed my_realloc_ALGD

[Flamefire]

There is an my_realloc_ALGD overload that takes unsigned values at

liquidSVM/sources/shared/system_support/memory_allocation.h

Line 86 in da19280

template <typename Template_type> void my_realloc_ALGD(Template_type* restrict__* pointer, unsigned size, unsigned& used_size);

which is not available if SYSTEM_WITH_64BIT is not defined:

liquidSVM/sources/shared/system_support/memory_allocation.h

Line 81 in da19280

#if defined (SYSTEM_WITH_64BIT)

However that overload is always used:

liquidSVM/sources/svm/solver/basic_svm.cpp

Line 166 in da19280

my_realloc_ALGD(&alpha_ALGD, training_set_size, used_size);

with used_size being and unsigned value:

liquidSVM/sources/svm/solver/basic_svm.cpp

Line 141 in da19280

unsigned used_size;

Please fix that

[terjekv]

Adding __aarch64__ to the flags as per what @Flamefire did for PowerPC allows for liquidSVM to build on aarch64.