moc: fix crash when playing AAC on musl

This moves a buffer (currently 36 KiB) to the heap, avoiding stack
overflow on musl.

srcpkgs/moc/patches/move-pcm-buffer-to-heap.patch

@@ -0,0 +1,28 @@
+--- player.c	2018-02-10 23:53:38.627091352 +0100
++++ player.c	2018-02-10 23:54:46.672519217 +0100
+@@ -444,7 +444,7 @@
+ {
+ 	bool eof = false;
+ 	bool stopped = false;
+-	char buf[PCM_BUF_SIZE];
++	char *const buf = xmalloc (PCM_BUF_SIZE);
+ 	int decoded = 0;
+ 	struct sound_params new_sound_params;
+ 	bool sound_params_change = false;
+@@ -486,7 +486,7 @@
+ 				status_msg ("Playing...");
+ 			}
+ 
+-			decoded = f->decode (decoder_data, buf, sizeof(buf),
++			decoded = f->decode (decoder_data, buf, PCM_BUF_SIZE,
+ 					&new_sound_params);
+ 
+ 			if (decoded)
+@@ -629,6 +629,7 @@
+ 		precache.f->close (precache.decoder_data);
+ 		precache_reset (&precache);
+ 	}
++	free (buf);
+ }
+ 
+ #if !defined(NDEBUG) && defined(DEBUG)

srcpkgs/moc/template

@@ -1,7 +1,7 @@
 # Template file for 'moc'
 pkgname=moc
 version=2.5.2
-revision=1
+revision=2
 build_style=gnu-configure
 hostmakedepends="pkg-config"
 makedepends="db-devel ncurses-devel libcurl-devel popt-devel ffmpeg-devel