multimedia/shotcut: update to 21.03.21

From ChangeLog: https://shotcut.org/blog/new-release-210321/

 * Fixed <tractor> and blank considered missing and blocking export
 * Added an Ignore button to the missing files error dialog in Export.
 * Fixed black frames appearing in Slideshow Generator
 * Fixed being able to use mouse wheel over Timeline and Keyframes zoom sliders
 * Improved sound quality with small changes in Speed with Pitch Compensation or
   Pitch audio filter (broke in v20.11).
 * Fixed the Timeline clip audio waveform incorrect after adding transition by
   dragging the clip left.
 * Fixed repairing a project file opened using a network path on Windows.
 * Fixed writing a raw FLAC file does not set its duration.
 * Fixed an elided file name in clip Properties can become the clip name.

Deleteing patch integrated upstream: https://github.com/mltframework/shotcut/pull/1050

Reported by:	portscout

multimedia/shotcut/Makefile

@@ -22,7 +22,7 @@ USE_GITHUB=	yes
 GH_ACCOUNT=	mltframework
 
 # Needed to be able to correctly check for updates in-app.
-FULLVERSION=	21.02.27
+FULLVERSION=	21.03.21
 
 USE_GL+=	gl
 USE_QT=		buildtools_build concurrent_build core declarative \

multimedia/shotcut/distinfo

@@ -1,3 +1,3 @@
-TIMESTAMP = 1614514351
-SHA256 (mltframework-shotcut-v21.02.27_GH0.tar.gz) = 5ca5a5fb4b13a9da72a1bcff665af5c55fff2516bc90850d128c282d1f4296e9
-SIZE (mltframework-shotcut-v21.02.27_GH0.tar.gz) = 4101402
+TIMESTAMP = 1616401712
+SHA256 (mltframework-shotcut-v21.03.21_GH0.tar.gz) = be668454896c540746a3d27c42c858d7652399722c7ec073c7cd3e52d7578ccd
+SIZE (mltframework-shotcut-v21.03.21_GH0.tar.gz) = 4101401

multimedia/shotcut/files/patch-src_util.cpp

@@ -1,22 +0,0 @@
---- src/util.cpp.orig	2021-02-27 02:57:47 UTC
-+++ src/util.cpp
-@@ -480,6 +480,19 @@ bool Util::isMemoryLow()
-         }
-     }
-     return false;
-+#elif defined(__FreeBSD__)
-+    QProcess p;
-+    p.start("sysctl -n hw.usermem");
-+    p.waitForFinished();
-+    auto lines = p.readAllStandardOutput();
-+    p.close();
-+    bool ok = false;
-+    auto availableKB = lines.toUInt(&ok);
-+    if (ok) {
-+	    return availableKB < kLowMemoryThresholdKB;
-+    }
-+
-+    return false;
- #elif defined(Q_OS_LINUX)
-     unsigned int availableKB = UINT_MAX;
-     QFile meminfo("/proc/meminfo");