MINGW package support

[taozuhong]

1. What version of ODPI-C are you using (see dpi.h)?
   5.6.4

2. What OS (and version) is your application on?
   Windows

3. What compiler (and version) did you use?
   GCC/LLVM

4. What is your version of the Oracle Client (e.g. Instant Client)? How was it installed? Where it is installed?
   Instant Client 23.7

5. What is your Oracle Database version?
   Oracle 23i

6. What is the PATH environment variable (on Windows) or LD_LIBRARY_PATH (on Linux) set to?
   PATH=%PATH%;%ORACLE_HOME%\instantclient_23_7

7. What environment variables did you set? How exactly did you set them?

8. What problem or error(s) you are seeing?
   The compile script not yet support MSYS2/Cygwin environment(make script and pkg config file), and failed to make a MINGW package for MSYS/Cygwin.

[taozuhong]

0001-Makefile.patch
This patch could make the library with Makefile with MSYS on Windows 11, but it's not the best choice, maybe Meson or CMake are good for it.