build: remove unecessary build steps

ref: longhorn/longhorn 5911

Signed-off-by: Jack Lin <jack.lin@suse.com>

Dockerfile.dapper

@@ -44,22 +44,6 @@ ENV GOLANG_ARCH_amd64=amd64 GOLANG_ARCH_arm64=arm64 GOLANG_ARCH_s390x=s390x GOLA
 RUN wget -O - https://storage.googleapis.com/golang/go1.20.3.linux-${!GOLANG_ARCH}.tar.gz | tar -xzf - -C /usr/local && \
     go install golang.org/x/lint/golint@latest
 
-# Build liblonghorn
-RUN cd /usr/src && \
-    git clone https://github.com/rancher/liblonghorn.git && \
-    cd liblonghorn && \
-    git checkout 53d1c063b95efc8d949b095bd4bf04637230265f && \
-    make; \
-    make install
-
-# Build TGT
-RUN cd /usr/src && \
-    git clone https://github.com/rancher/tgt.git && \
-    cd tgt && \
-    git checkout 3a8bc4823b5390e046f7aa8231ed262c0365c42c && \
-    make; \
-    make install
-
 # Install libqcow to resolve error:
 #   vendor/github.com/longhorn/longhorn-engine/pkg/qcow/libqcow.go:6:11: fatal error: libqcow.h: No such file or directory
 RUN wget -O - https://s3-us-west-1.amazonaws.com/rancher-longhorn/libqcow-alpha-20181117.tar.gz | tar xvzf - -C /usr/src