misc/py-pyqir: fix build on ARM / POWER

char on ARM / POWER is unsigned.

misc/py-pyqir/files/patch-qirlib_src_qis.rs

@@ -0,0 +1,32 @@
+--- qirlib/src/qis.rs.orig	2023-07-30 20:03:41 UTC
++++ qirlib/src/qis.rs
+@@ -1,6 +1,8 @@
+ // Copyright (c) Microsoft Corporation.
+ // Licensed under the MIT License.
+ 
++use std::os::raw::c_char;
++
+ use crate::{
+     builder::{build_if, try_build_if},
+     types,
+@@ -194,7 +196,7 @@ unsafe fn mz(module: LLVMModuleRef) -> LLVMValueRef {
+ 
+     let function = declare_qis(module, "mz", Functor::Body, ty);
+     let attr_name = "writeonly";
+-    let kind_id = LLVMGetEnumAttributeKindForName(attr_name.as_ptr().cast::<i8>(), attr_name.len());
++    let kind_id = LLVMGetEnumAttributeKindForName(attr_name.as_ptr().cast::<c_char>(), attr_name.len());
+     let attr = LLVMCreateEnumAttribute(context, kind_id, 0);
+     let result_param_index = 2; // indices are 1 based.
+     LLVMAddAttributeAtIndex(function, result_param_index, attr);
+@@ -208,9 +210,9 @@ unsafe fn add_irreversible_attr(context: LLVMContextRe
+     let irreversable = "irreversible";
+     let irreversable_attr = LLVMCreateStringAttribute(
+         context,
+-        irreversable.as_ptr().cast::<i8>(),
++        irreversable.as_ptr().cast::<c_char>(),
+         irreversable.len() as u32,
+-        "".as_ptr().cast::<i8>(),
++        "".as_ptr().cast::<c_char>(),
+         0,
+     );
+     LLVMAddAttributeAtIndex(function, LLVMAttributeFunctionIndex, irreversable_attr);