AST compile issues on Windows and non-gcc compilers

[veggiesaurus]

I'm trying to put together a build script for AST for vcpkg, which will make building and distributing AST-based software on Windows platforms far simpler. I've run into a few gcc-specific functions in the code, and I've attached a patch to fix these. The other build issue is that the Makefile.in file is missing a few $(EXEEXT) values.

The specific issues are:

• incrementing a void* pointer is only allowed in GCC (See https://stackoverflow.com/questions/3523145/pointer-arithmetic-for-void-pointer-in-c)
• An explicit cast to void, rather than to void* when using astSetSourceVel

@dsberry please see attached zip for patches to fix these issues. I'm not sure if this is the correct solution though. Should Makefile.in or Makefile.am be changed?

patches_ast.zip

[dsberry]

@veggiesaurus I've committed those patches. Although you're right that the $(EXEEXT) change needs to be made to Makefile.am rather than Makefile.in. Thanks for sending thsepatches.