Simplify static build.

It's simpler than I initially thought! We just have to use -tags static,
there's no need to pass linker flags as we can set LDFLAGS for cgo
right from go source file.

See golang/go#12058 (comment)
for discussion about it.

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

README.md

@@ -32,12 +32,7 @@ After installing OpenVZ, you might need to run:
 ## Building
 
 If you are going to build a binary that uses this package statically,
-i.e. you have something like `--ldflags '-extldflags "-static"'` or
-`--gccgoflags "-static"` in your `go build` command line, make sure
-to add `static` build tag, too, otherwise the linker will fail.
-Example:
-
-    go build --ldflags '-extldflags "-static"' -tags static
+you need to add `static` build tag to your `go build` command.
 
 ## Usage
 

ploop_link_static.go

@@ -3,4 +3,5 @@
 package ploop
 
 // #cgo pkg-config: --static ploop
+// #cgo LDFLAGS: -static
 import "C"