makefile.shared does not build static library despite readme stating so #808

Prerequisites

• Checked the developer manual
• Checked that your issue isn't already filed: https://github.com/issues?utf8=✓&q=repo%3Alibtom%2Flibtomcrypt
• Checked that your issue isn't due to the fact that you're using asymmetric cryptography and you forgot linking in and/or setting an MPI provider (usually this causes either random crashes or runtime errors like LTC_ARGCHK 'ltc_mp.name != NULL' failure ...). c.f. Ch. "Math Descriptors" of the developer manual.
• Checked that your issue isn't related to TomsFastMath's limitation that PK operations can by default only be done with max. 2048bit keys

Description

The README says:

but makefile.shared builds only shared lib.

Steps to Reproduce

make CFLAGS='-DUSE_GMP -DGMP_DESC' EXTRA_LIBS='-lgmp' -f makefile.shared

Version

v1.18.2-1245-g6c6d5104

Additional Information

The readme is misleading, yes, but the core problem is that makefile.shared should be fixed to build static lib as well, otherwise what's the proper way to build both static and shared library? Doing two separate builds with makefile.unix is just waste of time and resources when it could be done in a single run