libunwindow: Add disabled package

disabled-packages/libunwind/build.sh

@@ -0,0 +1,7 @@
+# Fails to build due to not finding struct elf_prstatus.
+# It is in <linux/elfcore.h> on Android, but including that file
+# causes problems due to elf types being redefined.
+TERMUX_PKG_HOMEPAGE=http://www.nongnu.org/libunwind/
+TERMUX_PKG_DESCRIPTION="Library to determine the call-chain of a program"
+TERMUX_PKG_VERSION=1.2~rc1
+TERMUX_PKG_SRCURL=http://download.savannah.gnu.org/releases/libunwind/libunwind-1.2-rc1.tar.gz