cargo applet to build and install C-ABI compatible dynamic and static
libraries.
It produces and installs a correct pkg-config file, a static library
and a dynamic library, and a C header to be used by any C (and
C-compatible) software.
devel/cargo-c: fix build on armv7
The address space does not suffice to build cargo-c on armv7 with LTO.
Disable LTO on armv6/armv7 to make the build succeed.
Approved by: portmgr (build fix blanket)
MFH: 2023Q4
(cherry picked from commit 77455882b6f8c9854c788f45d9fb4abd93555647)