[BUG] Compiler crashes when compiling hex numbers used in enum

[matusvalo]

Describe the bug

Compiling file with enum initialised with hex numbers crashes with traceback:

Error compiling Cython file:
------------------------------------------------------------
...
cdef enum SDL_BlendMode:
    SDL_BLENDMODE_NONE = 0x00000000,
    ^
------------------------------------------------------------

deleteme.pyx:2:4: Compiler crash in AnalyseDeclarationsTransform

File 'ModuleNode.py', line 203, in analyse_declarations: ModuleNode(deleteme.pyx:1:0,
    full_module_name = 'pygame.deleteme')
File 'Nodes.py', line 393, in analyse_declarations: StatListNode(deleteme.pyx:1:5)
File 'Nodes.py', line 1728, in analyse_declarations: CEnumDefNode(deleteme.pyx:1:5,
    name = 'SDL_BlendMode',
    visibility = 'private')
File 'Nodes.py', line 1786, in analyse_enum_declarations: CEnumDefItemNode(deleteme.pyx:2:4,
    name = 'SDL_BLENDMODE_NONE')

Compiler crash traceback from this point on:
  File "/Users/ness-skmac3/dev/cython/Cython/Compiler/Nodes.py", line 1786, in analyse_enum_declarations
    enum_value = int(self.value.value)
ValueError: invalid literal for int() with base 10: '0x00000000'

Code to reproduce the behaviour:

cdef enum SDL_BlendMode:
    SDL_BLENDMODE_NONE = 0x00000000,
    SDL_BLENDMODE_BLEND = 0x00000001,
    SDL_BLENDMODE_ADD = 0x00000002,
    SDL_BLENDMODE_MOD = 0x00000004,
    SDL_BLENDMODE_INVALID = 0x7FFFFFFF

Expected behaviour

Compilation success.

OS

any

Python version

any

Cython version

master

Additional context

Cython 0.29.X compiles example successfully