dev-scheme/stklos: fix build with USE=-threads

Closes: https://bugs.gentoo.org/931103
Signed-off-by: Akinori Hattori <hattya@gentoo.org>

dev-scheme/stklos/files/stklos-2.00-threads.patch

@@ -0,0 +1,22 @@
+--- a/src/stklos.h
++++ b/src/stklos.h
+@@ -46,15 +46,15 @@
+ #include <memory.h>
+ #include <locale.h>
+ #include <stdint.h>
+-#ifndef THEADS_NONE
++
++#include "stklosconf.h"
++#include "extraconf.h"
++#ifndef THREADS_NONE
+ #  include <pthread.h>
+ #  define GC_THREADS 1
+ #  define _REENTRANT 1
+ #endif
+ 
+-#include "stklosconf.h"
+-#include "extraconf.h"
+-
+ /* To debug the GC uncomment the following line */
+ /* #define GC_DEBUG 1 */
+ 

dev-scheme/stklos/stklos-2.00-r1.ebuild

@@ -23,6 +23,7 @@ DEPEND="${RDEPEND}"
 PATCHES=(
 	"${FILESDIR}"/${P}-gentoo.patch
 	"${FILESDIR}"/${P}-ldflags.patch
+	"${FILESDIR}"/${P}-threads.patch
 )
 DOCS=( AUTHORS ChangeLog NEWS.md PACKAGES-USED {PORTING-NOTES,README}.md SUPPORTED-SRFIS )