v0.5: Include <string.h> in shmem.c for strncpy()

Fixes building with current NDK/clang: 2fb093b

Fix conflicts with libc shmem symbols

Thanks to @xtkoba: 447caef

Update Makefile to respect DESTDIR

v0.31

Makefile: respect $(DESTDIR)

v0.3

Prevent attempts to lock mutex multiple times in shmget (#9).
Thanks to @dead10ck.

v0.2.1

• Added support for building static library.

v0.2

• Fix building with unified headers.

v0.1.2

• Do not report errors for non-local removals.

v0.1.1

• Use the install command when installing.

v0.1

• First tagged release for testing.