Commits on Mar 26, 2020

1. extconf: add sdk helper, primarily for macOS …

   macOS removed `/usr/include` in recent versions of macOS, which has
   broken the logic in this file and forced the usage of the internal
   libffi when macOS has a perfectly usable one itself.
   
   ```
   checking for ffi.h... no
   checking for ffi.h in /usr/local/include,/usr/include/ffi... no
   ```
   
   The internal libffi also seems to have some issues building on at least
   macOS 10.15/Catalina, and seemed to be the cause of my recent issues
   with other gems that depend on this one.
   
   ```
   linking shared-object ffi_c.bundle
   ld: warning: ignoring file ext/ffi_c/libffi-x86_64-darwin19/.libs/libffi_convenience.a,
   building for macOS-x86_64 but attempting to link with file built for unknown-unsupported file format
   ( 0x21 0x3C 0x61 0x72 0x63 0x68 0x3E 0x0A 0x2F 0x20 0x20 0x20 0x20 0x20 0x20 0x20 )
   ```
   
   This change allows us to use the built-in libffi, and works fine:
   
   ```
   checking for ffi.h... no
   checking for ffi.h in /usr/local/include,/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/ffi... yes
   checking for ffi_call() in -lffi... yes
   checking for ffi_closure_alloc()... yes
   checking for shlwapi.h... no
   checking for rb_thread_call_without_gvl()... yes
   checking for ruby_native_thread_p()... yes
   checking for ruby_thread_has_gvl_p()... yes
   checking for ffi_prep_cif_var()... yes
   checking for ffi_raw_call()... yes
   checking for ffi_prep_raw_closure()... yes
   ```

   

   DomT4 committed Mar 26, 2020
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