ruby: Fix syslog module to link against liblog

Fixes #962.

packages/ruby/build.sh

@@ -2,6 +2,7 @@ TERMUX_PKG_HOMEPAGE=https://www.ruby-lang.org/
 TERMUX_PKG_DESCRIPTION="Dynamic programming language with a focus on simplicity and productivity"
 _MAJOR_VERSION=2.4
 TERMUX_PKG_VERSION=${_MAJOR_VERSION}.1
+TERMUX_PKG_REVISION=1
 TERMUX_PKG_SRCURL=https://cache.ruby-lang.org/pub/ruby/${_MAJOR_VERSION}/ruby-${TERMUX_PKG_VERSION}.tar.xz
 TERMUX_PKG_SHA256=4fc8a9992de3e90191de369270ea4b6c1b171b7941743614cc50822ddc1fe654
 # libbffi is used by the fiddle extension module:

packages/ruby/ext-syslog-extconf.rb.patch

@@ -0,0 +1,10 @@
+diff -u -r ../ruby-2.4.1/ext/syslog/extconf.rb ./ext/syslog/extconf.rb
+--- ../ruby-2.4.1/ext/syslog/extconf.rb	2015-12-16 06:31:54.000000000 +0100
++++ ./ext/syslog/extconf.rb	2017-04-26 22:52:43.683243769 +0200
+@@ -7,5 +7,6 @@
+ have_header("syslog.h") &&
+   have_func("openlog") &&
+   have_func("setlogmask") &&
++  have_library("log", "__android_log_write") &&
+   create_makefile("syslog")
+