Remove liblapack-dev after R installation to reduce image size

[eitsupi]

Related to #390

In #386, the image size increased by 30MB as a result of the additional installation of liblapack-dev.
However, this appears to be acceptable to remove after R installation, so I would like to remove it and reduce the image size.

[eitsupi]

Sorry, I must have been mistaken.
It is clear from the test results that it is not possible to remove this library immediately after the installation of this R, so I will close this.

[kforner]

FWIW, the problem seems to lie with /usr/local/lib/R/modules/lapack.so:

$ ldd /usr/local/lib/R/modules/lapack.so 
	linux-vdso.so.1 (0x00007ffed91ff000)
	libR.so => not found
	liblapack.so.3 => not found
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fcebcc6e000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fcebca7c000)
	/lib64/ld-linux-x86-64.so.2 (0x00007fcebcdd6000)