Fix lsqlite3.lversion() and document local changes

Fixes #507

test/tool/net/base64_test.lua

@@ -13,6 +13,8 @@
 -- TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 -- PERFORMANCE OF THIS SOFTWARE.
 
+unix.pledge('stdio')
+
 local function test(s, b64)
     assert(EncodeBase64(s) == b64)
     assert(DecodeBase64(b64) == s)

test/tool/net/md5_test.lua

@@ -13,6 +13,8 @@
 -- TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 -- PERFORMANCE OF THIS SOFTWARE.
 
+unix.pledge('stdio')
+
 -- https://datatracker.ietf.org/doc/html/rfc1321#appendix-A.5
 assert(Md5("hello") == "\x5d\x41\x40\x2a\xbc\x4b\x2a\x76\xb9\x71\x9d\x91\x10\x17\xc5\x92")
 assert(Md5("") == "\xd4\x1d\x8c\xd9\x8f\x00\xb2\x04\xe9\x80\x09\x98\xec\xf8\x42\x7e")

test/tool/net/sha_test.lua

@@ -19,6 +19,8 @@
 --    5869).  As with RFC 4634, code to perform SHA-based Hashed Message
 --    Authentication Codes (HMACs) is also included.
 
+unix.pledge('stdio')
+
 -- SHA-1
 assert(Sha1("abc") == "\xa9\x99\x3e\x36\x47\x06\x81\x6a\xba\x3e\x25\x71\x78\x50\xc2\x6c\x9c\xd0\xd8\x9d")
 assert(