py-llvmmath, py-llvmpy: depend on outdated clang-3.3

[BjarneDMat]

--->  Computing dependencies for py36-llvmmath
--->  Dependencies to be installed: clang-3.3 py36-llvmpy llvm-3.3
--->  Fetching distfiles for clang-3.3
Error: clang-3.3 is not supported on macOS Sierra or newer.
Error: Failed to fetch clang-3.3: unsupported platform
Error: See .../clang-3.3/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port py36-llvmmath failed
--->  Scanning binaries for linking errors
--->  No broken files found.                             
--->  Computing dependencies for py36-llvmpy
--->  Dependencies to be installed: llvm-3.3
--->  Fetching distfiles for llvm-3.3
--->  Attempting to fetch llvm-3.3.src.tar.gz from http://nue.de.distfiles.macports.org/llvm
--->  Verifying checksums for llvm-3.3                                               
--->  Extracting llvm-3.3
--->  Applying patches to llvm-3.3
--->  Configuring llvm-3.3
Error: Failed to configure llvm-3.3, consult .../llvm-3.3/work/build/config.log
Error: Failed to configure llvm-3.3: configure failure: command execution failed
Error: See .../llvm-3.3/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port py36-llvmpy failed
--->  Scanning binaries for linking errors

[ryandesign (Ryan Schmidt)]

This is still a problem and needs to be fixed. As it stands, this port cannot be installed on the 3 most recent versions of macOS.

A comment in the port says "Keep in sync with py-llvmpy", so this applies to py-llvmpy too.

[stromnov (Andrew Stromnov)]

llvmpy was discontinued in favor of llvmlite five years ago.

llvmmath also was abandoned five years ago.