The new tests added are:
1. tst-dl_mseal: check memory sealing is applied for statically
linked binaries.
2. tst-dl_mseal-static: memory sealing is not applied if there is no
gnu attribute for statically linked binaries.
3. tst-dl-mseal: check memory sealing works as expected on multiples places:
- On the binary itself.
- On a LD_PRELOAD library.
- On a depedency modules (tst-dl_mseal-mod-{1,2}.so).
- On a audit modules (tst-dl_mseal-auditmod.so).
- On a dlopen dependency opened with RTLD_NODELETE).
- On the libgcc_s Aopened by thread unwind.
4. tst-dl-mseal-noseal: check if mixing object with and without
memory sealing works as expected.
Checked on x86_64-linux-gnu and aarch64-linux-gnu.