Add fixes to libunwind (#1069)

Author: trungnt2910

Makefile

@@ -441,6 +441,7 @@ COSMOPOLITAN_OBJECTS =			\
 	LIBC_TIME			\
 	THIRD_PARTY_MUSL		\
 	THIRD_PARTY_ZLIB_GZ		\
+	THIRD_PARTY_LIBUNWIND		\
 	LIBC_STDIO			\
 	THIRD_PARTY_GDTOA		\
 	THIRD_PARTY_REGEX		\

libc/runtime/unwind.c

@@ -11,3 +11,6 @@ ORIGIN
   Author: Tobias Hieta <[email protected]>
   Date:   Tue, 28 Nov 2023 09:52:28 +0100
 
+LOCAL CHANGES
+  - Fixed `_Unwind_FunctionContext` struct to be ABI-compatible with code
+  generated by GCC.

libc/runtime/unwind.h

@@ -28,6 +28,8 @@
 
 #if defined(_LIBUNWIND_BUILD_SJLJ_APIS)
 
+typedef uintptr_t _Unwind_Word __attribute__((__mode__(__unwind_word__)));
+
 struct _Unwind_FunctionContext {
   // next function in stack of handlers
   struct _Unwind_FunctionContext *prev;
@@ -47,7 +49,7 @@ struct _Unwind_FunctionContext {
   uint32_t                        resumeLocation;
 
   // set by personality handler to be parameters passed to landing pad function
-  uint32_t                        resumeParameters[4];
+  _Unwind_Word                    resumeParameters[4];
 #endif
 
   // set by calling function before registering