Whitespace cleanups

For manual pages from ports, show the ports category/name only the first
time the page is mentioned but not every time.

Add base64(3) man page for b64_ntop() and b64_pton()

Reviewed-and-improved-by: swildner

libc/net: Fix b64_pton() for some exact-sized buffer

When decoding a base64 string with padding, b64_pton() can fail when the
output buffer is exactly the needed size. For example, decoding the
fol

libc/net: Fix b64_pton() for some exact-sized buffer

When decoding a base64 string with padding, b64_pton() can fail when the
output buffer is exactly the needed size. For example, decoding the
following base64 string to buffer[32] would fail:

% dd if=/dev/random bs=32 count=1 | base64
FCiWkKuhdRq3tMmtAt9CpchTTYMlIW3U3gJsavDNxZI=

This commit fixes the above issue.

Reported-by: dczheng
Obtained-from: OpenBSD
See also: FreeBSD revision 275060, https://reviews.freebsd.org/D1218

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libc/net: Multiple minor cleanups to base64.c

* Remove unused but included headers.
* Use 'unsigned char' instead of 'u_char'.
* Properly cast 'char' to 'unsigned char'.
* Remove the debug Assert()s

libc/net: Multiple minor cleanups to base64.c

* Remove unused but included headers.
* Use 'unsigned char' instead of 'u_char'.
* Properly cast 'char' to 'unsigned char'.
* Remove the debug Assert()s.

Partially obtained from OpenBSD.

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libc: Remove libc checks around manual pages from the Makefile.inc's.

Handle this better by setting NOMAN for libc_rtld.