[Eva] add spec and builtin for reallocarray (GNU libc)

share/libc/stdlib.h

src/plugins/e-acsl/tests/builtin/oracle/gen_strcat.c

src/plugins/e-acsl/tests/builtin/oracle/gen_strcmp.c

src/plugins/e-acsl/tests/builtin/oracle/gen_strcpy.c

src/plugins/e-acsl/tests/builtin/oracle/gen_strlen.c

src/plugins/e-acsl/tests/builtin/oracle/strcat.res.oracle

src/plugins/e-acsl/tests/builtin/oracle/strcmp.res.oracle

src/plugins/e-acsl/tests/builtin/oracle/strcpy.res.oracle

src/plugins/e-acsl/tests/builtin/oracle/strlen.res.oracle

...ns/e-acsl/tests/concurrency/oracle/gen_parallel_threads.c

...ugins/e-acsl/tests/concurrency/oracle/gen_threads_debug.c

...acsl/tests/concurrency/oracle/parallel_threads.res.oracle

.../e-acsl/tests/concurrency/oracle/threads_debug.res.oracle

src/plugins/e-acsl/tests/format/oracle/fprintf.res.oracle

src/plugins/e-acsl/tests/format/oracle/gen_fprintf.c

src/plugins/e-acsl/tests/format/oracle/gen_printf.c

src/plugins/e-acsl/tests/format/oracle/printf.res.oracle

src/plugins/e-acsl/tests/memory/oracle/gen_memalign.c

src/plugins/e-acsl/tests/memory/oracle/memalign.res.oracle

src/plugins/e-acsl/tests/temporal/oracle/gen_t_getenv.c