Remove no-pic patch

For two reasons:
1) Alpine has fixed the issue (http://git.alpinelinux.org/cgit/aports/tree/community/go/default-buildmode-pie.patch)
2) The patch doesn't work for some platforms where Golang adopts external linker (golang/go#17847). Although Golang developers has fixed the issue with disabling PIE, above Alpine solution is more secure

So, Alpine Go (installed by apk) is better choice.

Author: wei xiao

1.7/alpine/Dockerfile

@@ -2,36 +2,11 @@ FROM alpine:3.4
 
 RUN apk add --no-cache ca-certificates
 
-ENV GOLANG_VERSION 1.7.3
-ENV GOLANG_SRC_URL https://golang.org/dl/go$GOLANG_VERSION.src.tar.gz
-ENV GOLANG_SRC_SHA256 79430a0027a09b0b3ad57e214c4c1acfdd7af290961dd08d322818895af1ef44
-
-# https://golang.org/issue/14851
-COPY no-pic.patch /
-
 RUN set -ex \
-	&& apk add --no-cache --virtual .build-deps \
-		bash \
-		gcc \
-		musl-dev \
-		openssl \
-		go \
-	\
-	&& export GOROOT_BOOTSTRAP="$(go env GOROOT)" \
-	\
-	&& wget -q "$GOLANG_SRC_URL" -O golang.tar.gz \
-	&& echo "$GOLANG_SRC_SHA256  golang.tar.gz" | sha256sum -c - \
-	&& tar -C /usr/local -xzf golang.tar.gz \
-	&& rm golang.tar.gz \
-	&& cd /usr/local/go/src \
-	&& patch -p2 -i /no-pic.patch \
-	&& ./make.bash \
-	\
-	&& rm -rf /*.patch \
-	&& apk del .build-deps
+	&& apk add --no-cache go
 
 ENV GOPATH /go
-ENV PATH $GOPATH/bin:/usr/local/go/bin:$PATH
+ENV PATH $GOPATH/bin:$PATH
 
 RUN mkdir -p "$GOPATH/src" "$GOPATH/bin" && chmod -R 777 "$GOPATH"
 WORKDIR $GOPATH