multimedia/shotcut: fix build on big-endian

Also remove unnecessary post-patch:
Warning: Possible REINPLACE_CMD issues:
- - REINPLACE_CMD ran, but did not modify file contents: src/jobs/meltjob.cpp

multimedia/shotcut/Makefile

@@ -14,7 +14,7 @@ LIB_DEPENDS=	libmlt.so:multimedia/mlt
 RUN_DEPENDS=	ffmpeg:multimedia/ffmpeg \
 		${LOCALBASE}/lib/libjack.so:audio/jack
 
-USES=		desktop-file-utils gl pkgconfig \
+USES=		compiler:c++11-lang desktop-file-utils gl pkgconfig \
 		qmake qt:5 sdl shared-mime-info \
 		xorg
 
@@ -46,9 +46,6 @@ LADSPA_RUN_DEPENDS=	swhplugins>=0:audio/swhplugins
 
 WEBVFX_RUN_DEPENDS=	${LOCALBASE}/lib/mlt/libmltwebvfx.so:multimedia/webvfx-qt5
 
-post-patch:
-	@${REINPLACE_CMD} -e 's/"qmelt"/"melt"/' ${WRKSRC}/src/jobs/meltjob.cpp
-
 pre-build:
 	@${FIND} ${WRKSRC} -name '.depend' -delete
 

multimedia/shotcut/files/patch-src_spatialmedia_constants.h

@@ -0,0 +1,11 @@
+--- src/spatialmedia/constants.h.orig	2020-12-28 20:21:17 UTC
++++ src/spatialmedia/constants.h
+@@ -36,6 +36,8 @@
+ #  define le64toh(x) qFromLittleEndian(x)
+ #elif !defined(__FreeBSD__)
+ #  include <endian.h>
++#elif defined(__FreeBSD__)
++#  include <sys/endian.h>
+ #endif
+ 
+ struct AudioMetadata {