[libobjc2]: Fix exception handling

libobjc2 used Vectored Exception Handlers to catch uncaught exceptions on mingw. This implementation is too greedy, and invokes `_objc_unexpected_exception` for (certain) exceptions which would be handled by the application itself.

This patch `_Unwind_RaiseException` to throw exceptions instead of `__cxa_throw`, allowing us to process unhandled exceptions.

Upstream PR: gnustep/libobjc2#278

Author: qmfrederik

mingw-w64-libobjc2/PKGBUILD

@@ -21,18 +21,22 @@ source=("https://github.com/gnustep/${_realname}/archive/v${pkgver}/${_realname}
         # Support building on msys/clang64
         "https://github.com/gnustep/libobjc2/commit/1ff5e1298dd76aa370d5a12b690857f9a47b4b56.patch"
         # MinGW: Remove manual setting of library prefix/suffix
-        "https://github.com/gnustep/libobjc2/commit/f983cdbf683925d942dd1d86edcfe4316bf9ed6c.patch")
+        "https://github.com/gnustep/libobjc2/commit/f983cdbf683925d942dd1d86edcfe4316bf9ed6c.patch"
+        # MinGW: Use _Unwind_RaiseException to throw exceptions
+        "https://github.com/gnustep/libobjc2/commit/38ebb38bcd5b4af43ddb87a5f34bc4b907795f82.patch")
 sha256sums=('c4c5cede579949249f16736c9b1f85c58c44addb013f59970dcb566d9069152a'
             'aaa23146b3c2ec442b5dbf20606020bddd15230041ad738ef3a06e92d13605c3'
             'fba7d33aa03ee7383b559c5b845063acd16b45396520250849f22559577adcc9'
-            'd955fcee075af724a97d63f1b325e97ab6c3d018ac38f0597ef3e8c57b0820e2')
+            'd955fcee075af724a97d63f1b325e97ab6c3d018ac38f0597ef3e8c57b0820e2'
+            '9bc16c12d0cf0f4e2aab4d7222aa6b4ffa6055ae30e40890d7e0e972db6dd532')
 
 prepare() {
   cd ${srcdir}/${_realname}-${pkgver}
 
   patch -p1 -i ${srcdir}/639c676bb8033422539e19a2e2888bdbd06507e5.patch
   patch -p1 -i ${srcdir}/1ff5e1298dd76aa370d5a12b690857f9a47b4b56.patch
   patch -p1 -i ${srcdir}/f983cdbf683925d942dd1d86edcfe4316bf9ed6c.patch
+  patch -p1 -i ${srcdir}/38ebb38bcd5b4af43ddb87a5f34bc4b907795f82.patch
 }
 
 build() {