fix build on aarch64 #72
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```
$ make
gcc -std=gnu99 -D_DEFAULT_SOURCE -fPIC -DPIC -ggdb3 -O2 -Wall -Iinclude -Iarch/aarch64 -Iarch/common -Iarch/common/include -DFORCE_SOFT_FLOAT -DEXPORT_UNPREFIXED -c -o arch/aarch64/makecontext.o arch/aarch64/makecontext.c
arch/aarch64/makecontext.c: In function ‘libucontext_makecontext’:
arch/aarch64/makecontext.c:48:14: error: assignment to ‘long unsigned int *’ from incompatible pointer type ‘long long unsigned int *’ [-Wincompatible-pointer-types]
48 | regp = &(ucp->uc_mcontext.regs[0]);
| ^
make: *** [Makefile:155: arch/aarch64/makecontext.o] Error 1
```
this both fixes the build error and fixes the rest of mcontext_t to be
compatible with glibc
built on top of the work done in kaniini#59
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this both fixes the build error and fixes the rest of mcontext_t to be compatible with glibc
built on top of the work done in #59 as that patch can't be applied anymore