sqlite: better method of disabling readline

extra/sqlite/build

@@ -1,16 +1,14 @@
 #!/bin/sh -e
 
-export CPPFLAGS="-DSQLITE_ENABLE_COLUMN_METADATA=1"
-
-sed 's/ -ltinfo//g' configure > _
-mv -f _ configure
-chmod +x configure
+# Required by qt5 and possibly other software.
+export CPPFLAGS="$CPPFLAGS -DSQLITE_ENABLE_COLUMN_METADATA=1"
 
 ./configure \
     --prefix=/usr \
     --enable-threadsafe \
     --enable-dynamic-extensions \
-    --enable-fts5
+    --enable-fts5 \
+    ac_cv_search_readline=no \
 
 make
 make install