Commits on Feb 2, 2022

1. Add extern "C" to headers for easier use by C++ …

   Add `extern "C"` directly to all headers except efivar-guids.h, which
   is generated. Because it interferes with C compilers, wrap each
   `extern` in an `#ifdef __cplusplus`. For efivar-guids.h update the
   generator, makeguids.c, to add the desired code.
   
   From https://en.cppreference.com/w/cpp/language/language_linkage:
   > extern "C" makes it possible to include header files containing
   > declarations of C library functions in a C++ program, but if the
   > same header file is shared with a C program, extern "C" (which
   > is not allowed in C) must be hidden with an appropriate #ifdef,
   > typically __cplusplus.
   
   Signed-off-by: Ted Brandston <tbrandston@google.com>

   

   tedbrandston committed Feb 2, 2022
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