(#1408) Add internal (scope) wrapper to secure_getenv

- this will remove usage of `secure_getenv` in contrib code
- `secure_get_env` is not supported by musl version prior 1.1.24

Fixes #1408

contrib/redefine_syms.lst

@@ -72,6 +72,7 @@ read scopelibc_read
 readdir scopelibc_readdir
 realloc scopelibc_realloc
 recvfrom scopelibc_recvfrom
+secure_getenv scope_secure_getenv
 select scopelibc_select
 sendto scopelibc_sendto
 setbuf scopelibc_setbuf

src/scopestdlib.c

@@ -1304,3 +1304,8 @@ int
 scope_mq_getattr(mqd_t mqd, struct mq_attr *attr) {
     return scopelibc_mq_getattr(mqd, attr);
 }
+
+char *
+scope_secure_getenv(const char *name) {
+    return getenv(name);
+}