Code uses non-C99 compliant constructs

[michael-o]

1. What versions are you using?

Oracle Client 19/Oracle Database 10 SE2

2. Is it an error or a hang or a crash?

Does not properly build

3. What error(s) or behavior you are seeing?

This is Cython fix for oracle/odpi#205. Change is here: main...michael-o:python-oracledb:c99-compliance

Works on LLVM and HP aCC.

You can simulate the issue on LLVM or GCC by setting: EXTRA_CFLAGS ?= -std=c99 -pedantic