txr: fix build on big endian

srcpkgs/txr/patches/nolibffi-endian.patch

@@ -0,0 +1,18 @@
+commit 161de911edd37a0f64e42dfedfd9b35b212056e6
+Author: q66 <daniel@octaforge.org>
+Date:   Mon Jan 6 15:15:22 2020 +0100
+
+    fix non-libffi build on big endian
+
+diff --git ffi.c ffi.c
+index 816afc4..535ca31 100644
+--- ffi.c
++++ ffi.c
+@@ -83,6 +83,7 @@ typedef struct ffi_type {
+   char type, size;
+ } ffi_type;
+ #define FFI_TYPE_STRUCT 0
++typedef unsigned long ffi_arg;
+ #endif
+ 
+ typedef enum {

srcpkgs/txr/template

@@ -4,6 +4,7 @@ version=227
 revision=1
 build_style=configure
 make_check_target=tests
+# enabling libffi causes double-free errors with musl
 hostmakedepends="bison flex"
 short_desc="Programming language for convenient data munging"
 maintainer="Oliver Kiddle <okiddle@yahoo.co.uk>"