add abseil recipe

recipes/abseil/all/patches/20230802.1-0001-fix-mingw.patch

@@ -0,0 +1,40 @@
+--- a/absl/synchronization/internal/pthread_waiter.h
++++ b/absl/synchronization/internal/pthread_waiter.h
+@@ -16,7 +16,7 @@
+ #ifndef ABSL_SYNCHRONIZATION_INTERNAL_PTHREAD_WAITER_H_
+ #define ABSL_SYNCHRONIZATION_INTERNAL_PTHREAD_WAITER_H_
+ 
+-#ifndef _WIN32
++#if !defined(_WIN32) && !defined(__MINGW32__)
+ #include <pthread.h>
+ 
+ #include "absl/base/config.h"
+@@ -55,6 +55,6 @@ class PthreadWaiter : public WaiterCrtp<PthreadWaiter> {
+ ABSL_NAMESPACE_END
+ }  // namespace absl
+ 
+-#endif  // ndef _WIN32
++#endif  // !defined(_WIN32) && !defined(__MINGW32__)
+ 
+ #endif  // ABSL_SYNCHRONIZATION_INTERNAL_PTHREAD_WAITER_H_
+--- a/absl/synchronization/internal/win32_waiter.h
++++ b/absl/synchronization/internal/win32_waiter.h
+@@ -20,7 +20,8 @@
+ #include <sdkddkver.h>
+ #endif
+ 
+-#if defined(_WIN32) && _WIN32_WINNT >= _WIN32_WINNT_VISTA
++#if defined(_WIN32) && !defined(__MINGW32__) && \
++    _WIN32_WINNT >= _WIN32_WINNT_VISTA
+ 
+ #include "absl/base/config.h"
+ #include "absl/synchronization/internal/kernel_timeout.h"
+@@ -65,6 +66,7 @@ class Win32Waiter : public WaiterCrtp<Win32Waiter> {
+ ABSL_NAMESPACE_END
+ }  // namespace absl
+ 
+-#endif  // defined(_WIN32) && _WIN32_WINNT >= _WIN32_WINNT_VISTA
++#endif  // defined(_WIN32) && !defined(__MINGW32__) &&
++        // _WIN32_WINNT >= _WIN32_WINNT_VISTA
+ 
+ #endif  // ABSL_SYNCHRONIZATION_INTERNAL_WIN32_WAITER_H_