Revert "libucontext: update to 0.13.1"

This reverts commit 042d921f6e.

@pullmoll

Newer libucontext seems to break ABI, which results in lots of
things suddenly failing to build, e.g.

/usr/bin/ld: /lib64/libunwind.so.8: undefined reference to `__setcontext'
/usr/bin/ld: /usr/lib/libgstreamer-1.0.so: undefined reference to `__getcontext'
collect2: error: ld returned 1 exit status

I suspect because of

99ed5bbe12

srcpkgs/libucontext/template

@@ -1,17 +1,16 @@
 # Template file for 'libucontext'
 pkgname=libucontext
-version=0.13.1
-revision=1
+reverts="0.13.1_1"
+version=0.11
+revision=2
 archs="*-musl"
 wrksrc="${pkgname}-${pkgname}-${version}"
-make_build_args="all docs"
-hostmakedepends="scdoc"
 short_desc="Compatibility layer providing ucontext functions"
 maintainer="Jürgen Buchmüller <pullmoll@t-online.de>"
 license="ISC"
 homepage="https://github.com/kaniini/libucontext"
 distfiles="https://github.com/kaniini/libucontext/archive/${pkgname}-${version}.tar.gz"
-checksum=5d3517d12f1a605713cfb94c1ceda89e399bf534a4a85c9ff356cc329e12e4c1
+checksum=ec122a4bca8f75922082c4f4d81b09ff3e950906d7f5504e0bce367ec9a6fceb
 
 case "${XBPS_TARGET_MACHINE}" in
 arm*)	export LIBUCONTEXT_ARCH="arm";;
@@ -35,7 +34,6 @@ do_check() {
 
 do_install() {
 	make ARCH="${LIBUCONTEXT_ARCH}" DESTDIR="${DESTDIR}/usr" install
-	make ARCH="${LIBUCONTEXT_ARCH}" DESTDIR="${DESTDIR}" install_docs
 }
 
 post_install() {
@@ -48,6 +46,5 @@ libucontext-devel_package() {
 	pkg_install() {
 		vmove "usr/lib/*.so"
 		vmove "usr/lib/*.a"
-		vmove usr/share/man
 	}
 }