build: Link against libtinfo.so.

At least Debian and Fedora do this.

Fixes issues like this:

    gawk: symbol lookup error: /usr/lib/core-linux-eglibc/libreadline.so.6: undefined symbol: UP

1 files changed, 1 insertions, 1 deletions

diff --git a/build b/build
index 60c5e2f..be52075 100755
--- a/build
+++ b/build
@@ -10,7 +10,7 @@ configure:
 	touch $@
 
 build: configure
-	oh-autobuild
+	oh-autobuild -- SHLIB_LIBS='-ltinfo'
 	touch $@
 
 install: build