Get rid of the with-static.sh script

CGO can perform variable substitution in the directives, so we don't
need to use a script to set up the variables; we can let the go tool do
it for us.

Makefile

@@ -5,7 +5,7 @@ build-libgit2:
 
 test: build-libgit2
 	go run script/check-MakeGitError-thread-lock.go
-	./script/with-static.sh go test ./...
+	go test ./...
 
 install: build-libgit2
-	./script/with-static.sh go install ./...
+	go install ./...

README.md

@@ -44,15 +44,14 @@ libgit2 uses OpenSSL and LibSSH2 for performing encrypted network connections. F
 Running the tests
 -----------------
 
-For the stable version, `go test` will work as usual. For the `next` branch, similarly to installing, running the tests requires linking against the local libgit2 library, so the Makefile provides a wrapper
+For the stable version, `go test` will work as usual. For the `next` branch, similarly to installing, running the tests requires building a local libgit2 library, so the Makefile provides a wrapper
 
     make test
 
-Alternatively, if you want to pass arguments to `go test`, you can use the script that sets it all up
+Alternatively, you can build the library manually first and then run the tests
 
-    ./script/with-static.sh go test -v
-
-which will run the specified arguments with the correct environment variables.
+    ./script/build-libgit2-static.sh
+    go test -v
 
 License
 -------

git.go

@@ -1,6 +1,9 @@
 package git
 
 /*
+#cgo CFLAGS: -I${SRCDIR}/vendor/libgit2/include
+#cgo LDFLAGS: ${SRCDIR}/vendor/libgit2/build/libgit2.a
+#cgo pkg-config: --static ${SRCDIR}/vendor/libgit2/build/libgit2.pc
 #include <git2.h>
 #include <git2/sys/openssl.h>
 */

script/with-static.sh

@@ -1,12 +0,0 @@
-#!/bin/sh
-
-set -ex
-
-export BUILD="$PWD/vendor/libgit2/build"
-export PCFILE="$BUILD/libgit2.pc"
-
-FLAGS=$(pkg-config --static --libs $PCFILE) || exit 1
-export CGO_LDFLAGS="$BUILD/libgit2.a -L$BUILD ${FLAGS}"
-export CGO_CFLAGS="-I$PWD/vendor/libgit2/include"
-
-$@