Stop hardcoding -O3 -march=native, respect CXXFLAGS/LDFLAGS

Spotted on riscv64 where -march=native isn't supported.
ok sdk@ (maintainer)

x11/zutty/Makefile

@@ -1,10 +1,11 @@
-# $OpenBSD: Makefile,v 1.1.1.1 2022/01/14 19:25:17 sdk Exp $
+# $OpenBSD: Makefile,v 1.2 2022/01/27 00:32:39 jca Exp $
 
 COMMENT =	X terminal which uses OpenGL ES Compute Shaders
 
 GH_ACCOUNT =	tomszilagyi
 GH_PROJECT =	zutty
 GH_TAGNAME =	0.11
+REVISION =	0
 
 CATEGORIES =	x11
 
@@ -22,6 +23,10 @@ WANTLIB += Xext Xmu Xt c freetype m xcb z
 
 COMPILER=	base-clang ports-gcc
 
+CONFIGURE_ENV =	CFLAGS="${CFLAGS}" \
+		CXXFLAGS="${CXXFLAGS}" \
+		LDFLAGS="${LDFLAGS}"
+
 do-configure:
 	cd ${WRKSRC} && env -i ${CONFIGURE_ENV} \
 		${MODPY_BIN} ./waf configure --prefix=${PREFIX}

x11/zutty/patches/patch-wscript

@@ -0,0 +1,18 @@
+$OpenBSD: patch-wscript,v 1.1 2022/01/27 00:32:39 jca Exp $
+
+Respect CXXFLAGS/LDFLAGS.
+
+Index: wscript
+--- wscript.orig
++++ wscript
+@@ -69,10 +69,6 @@ def configure(cfg):
+            ['-DDEBUG', '-Og', '-g', '-ggdb'])
+     else:
+         cfg.env.target = 'zutty'
+-        cfg.env.append_value('CXXFLAGS',
+-           ['-Werror', '-O3', '-march=native', '-mtune=native', '-flto'])
+-        cfg.env.append_value('LINKFLAGS',
+-           ['-flto'])
+ 
+     cfg.check_cfg(package='freetype2', args=['--cflags', '--libs'],
+                   uselib_store='FT')