Makefile.m32: delete legacy component bits [ci skip]

- Drop auto-detection of OpenSSL 1.0.2 and earlier. Now always defaulting
  to OpenSSL 1.1.0 and later, LibreSSL and BoringSSL.

- Drop `Invalid path to OpenSSL package` detection. OpenSSL has been
  using a standard file layout since 1.1.0, so this seems unnecessary
  now.

- Drop special logic to enable Novell LDAP SDK support.

- Drop special logic to enable OpenLDAP LDAP SDK support. This seems
  to be distinct from native OpenLDAP, with support implemented inside
  `lib/ldap.c` (vs. `lib/openldap.c`) back when the latter did not exist
  yet in curl.

- Add `-lwldap32` only if there is no other LDAP library (either native
  OpenLDAP, or SDKs above) present.

- Update `doc/INSTALL.md` accordingly.

After this patch, it's necessary to make configration changes when using
OpenSSL 1.0.2 or earlier, or the two LDAP SDKs.

OpenSSL 1.0.2 and earlier:
```
export OPENSSL_INCLUDE = <path-to-openssl>/outinc
export OPENSSL_LIBPATH = <path-to-openssl>/out
export OPENSSL_LIBS = -lssl32 -leay32 -lgdi32
```

Novell LDAP SDK, previously enabled via `USE_LDAP_NOVELL=1`:
```
export CURL_CFLAG_EXTRAS = -I<path-to-sdk>/inc -DCURL_HAS_NOVELL_LDAPSDK
export CURL_LDFLAG_EXTRAS = -L<path-to-sdk>/lib/mscvc -lldapsdk -lldapssl -lldapx
```

OpenLDAP LDAP SDK, previously enabled via `USE_LDAP_OPENLDAP=1`:
```
export CURL_CFLAG_EXTRAS = -I<path-to-sdk>/include -DCURL_HAS_OPENLDAP_LDAPSDK
export CURL_LDFLAG_EXTRAS = -L<path-to-sdk>/lib -lldap -llber
```

I haven't tested these scenarios, and in general we recommend using
a recent OpenSSL release. Also, WinLDAP (the Windows default) and
OpenLDAP (via `-DUSE_OPENLDAP`) are the LDAP options actively worked on
in curl.

Closes #9631

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