lmms: fix duplicate plugins

Fixes #35306

srcpkgs/lmms/patches/fix-duplicate-plugin-dir.patch

@@ -0,0 +1,16 @@
+PLUGIN_DIR is defined as ${LIB_DIR}/lmms (/usr/lib64/lmms) by the build system
+and is also added to the search path, since its a symlink to /usr/lib we end up
+with the same directory but with a different path, resulting in duplicated
+plugins.
+
+--- a/src/core/PluginFactory.cpp
++++ b/src/core/PluginFactory.cpp
+@@ -63,7 +63,7 @@
+ 	//      e.g. binary at "C:/Program Files/LMMS/lmms.exe"
+ 	//           plugins at "C:/Program Files/LMMS/plugins/"
+ 
+-#ifndef LMMS_BUILD_WIN32
++#if !defined(LMMS_BUILD_WIN32) && !defined(PLUGIN_DIR)
+ 	addRelativeIfExists("../lib/lmms"); // Installed
+ #endif
+ 	addRelativeIfExists("plugins"); // Portable

srcpkgs/lmms/template

@@ -1,7 +1,7 @@
 # Template file for 'lmms'
 pkgname=lmms
 version=1.2.2
-revision=2
+revision=3
 archs="~armv6*"
 wrksrc=${pkgname}
 build_style=cmake