mimalloc, new recipe (#9059)

dev-libs/mimalloc/patches/mimalloc-2.1.2.patchset

@@ -0,0 +1,50 @@
+From 6c72e7b0df1484c7f8a6a1967030b31f6d6790d0 Mon Sep 17 00:00:00 2001
+From: Begasus <begasus@gmail.com>
+Date: Fri, 21 Jul 2023 12:49:43 +0000
+Subject: Don't hardcode install paths
+
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 2bcd1ef..72ea2f1 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -262,11 +262,6 @@ if(MI_USE_CXX)
+   endif()
+ endif()
+ 
+-if(CMAKE_SYSTEM_NAME MATCHES "Haiku")
+-   SET(CMAKE_INSTALL_LIBDIR ~/config/non-packaged/lib)
+-   SET(CMAKE_INSTALL_INCLUDEDIR ~/config/non-packaged/headers)
+- endif()
+-
+ # Compiler flags
+ if(CMAKE_C_COMPILER_ID MATCHES "AppleClang|Clang|GNU")
+   list(APPEND mi_cflags -Wall -Wextra -Wno-unknown-pragmas -fvisibility=hidden)
+-- 
+2.37.3
+
+
+From ad9c184f58d2f1bec4907a86dd9b6faaba9c5274 Mon Sep 17 00:00:00 2001
+From: Begasus <begasus@gmail.com>
+Date: Fri, 21 Jul 2023 13:54:29 +0000
+Subject: Fix missing header on Haiku
+
+
+diff --git a/src/prim/unix/prim.c b/src/prim/unix/prim.c
+index 314281f..605a684 100644
+--- a/src/prim/unix/prim.c
++++ b/src/prim/unix/prim.c
+@@ -55,6 +55,10 @@ terms of the MIT license. A copy of the license can be found in the file
+   #include <sys/syscall.h>
+ #endif
+ 
++#if defined(__HAIKU__)
++#include <fcntl.h>
++#endif
++
+ //------------------------------------------------------------------------------------
+ // Use syscalls for some primitives to allow for libraries that override open/read/close etc.
+ // and do allocation themselves; using syscalls prevents recursion when mimalloc is 
+-- 
+2.37.3
+