secmem.c migration into gpgrt.
* src/secmem.c: Include gpgrt-int.h instead of g10lib.h. (PROPERLY_ALIGNED_TYPE): Define here with uint64_t. Originally in libgcrypt/src/types.h. (SECMEM_LOCK, SECMEM_UNLOCK): Use _gpgrt_* functions, instead. (*): Use _gpg_err_set_errno instead (underscore version). (*): Use _gpgrt_log_* functions instead (underscore version).