rapidjson: remove faulty patch and ignore errors for now

the patch intended to fix compilation broke rapidjson as documented in
https://github.com/void-linux/void-packages/issues/25912
I verified this by compiling and running the test suite with and without
the patch applied.

There is a proposed fix in https://github.com/Tencent/rapidjson/pull/1698
which seemingly was rejected by the upstream developers, the issue
is documented at https://github.com/Tencent/rapidjson/issues/1700.
Since upstream insists that what they are doing is correct, make the
compiler ignore the errors for now. Alternatively, we could still
apply the proposed patch to our package.

srcpkgs/rapidjson/patches/0002-gcc81-copy-assignment.patch

@@ -1,20 +0,0 @@
---- include/rapidjson/document.h	2016-08-25 09:59:05.000000000 +0200
-+++ include/rapidjson/document.h	2018-05-30 09:55:35.028135241 +0200
-@@ -1936,7 +1936,7 @@
-         if (count) {
-             GenericValue* e = static_cast<GenericValue*>(allocator.Malloc(count * sizeof(GenericValue)));
-             SetElementsPointer(e);
--            std::memcpy(e, values, count * sizeof(GenericValue));
-+            *e = *values;
-         }
-         else
-             SetElementsPointer(0);
-@@ -1949,7 +1949,7 @@
-         if (count) {
-             Member* m = static_cast<Member*>(allocator.Malloc(count * sizeof(Member)));
-             SetMembersPointer(m);
--            std::memcpy(m, members, count * sizeof(Member));
-+            *m = *members;
-         }
-         else
-             SetMembersPointer(0);

srcpkgs/rapidjson/template

@@ -1,7 +1,7 @@
 # Template file for 'rapidjson'
 pkgname=rapidjson
 version=1.1.0
-revision=3
+revision=4
 build_style=cmake
 short_desc="Fast JSON parser/generator for C++ with both SAX/DOM style API"
 maintainer="Alexander Egorenkov <egorenar-dev@posteo.net>"
@@ -10,7 +10,8 @@ homepage="https://github.com/miloyip/rapidjson"
 distfiles="https://github.com/miloyip/${pkgname}/archive/v${version}.tar.gz"
 checksum=bf7ced29704a1e696fbccf2a2b4ea068e7774fa37f6d7dd4039d0787f8bed98e
 
-CXXFLAGS="-Wno-type-limits"
+# class-memaccess is required by https://github.com/Tencent/rapidjson/issues/1700
+CXXFLAGS="-Wno-type-limits -Wno-error=class-memaccess"
 
 post_patch() {
 	# Remove bin/jsonchecker, which is the JSON licensed files