Remove use of designated initializers

[springmeyer]

Designated initializers are a c99 feature not officially unsupported in C++/C++11. They are used in the hershey font hack and this code will not compile with g++ on linux. Clang happens to support them but we should not depend on this. You can see that support is a clang c99 extension if you build with -pedantic:

$ clang++ -o t src/geometry/debug_font_buffer.cpp -pedantic -Iinclude
In file included from src/geometry/debug_font_buffer.cpp:5:
src/geometry/debug_font.cpp:3:22: warning: zero size arrays are an extension [-Wzero-length-array]
int8_t simplex_0[] = { };
                     ^
src/geometry/debug_font.cpp:108:16: warning: designated initializers are a C99 feature [-Wc99-extensions]
    [' ']  = { .width = 16, .length = sizeof(simplex_0), .data = simplex_0 },
               ^~~~~~~~~~~
src/geometry/debug_font.cpp:108:29: warning: designated initializers are a C99 feature [-Wc99-extensions]
    [' ']  = { .width = 16, .length = sizeof(simplex_0), .data = simplex_0 },
                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~
src/geometry/debug_font.cpp:108:58: warning: designated initializers are a C99 feature [-Wc99-extensions]
    [' ']  = { .width = 16, .length = sizeof(simplex_0), .data = simplex_0 },
                                                         ^~~~~~~~~~~~~~~~~

[kkaefer]

Dang, I knew that it was C99 only, but I thought I could sneak this through ;)

[springmeyer]

It looks like this will compile with g++ 4.8:

glyph simplex[127] = {
   { 16, sizeof(simplex_0), simplex_0 },
   ....
};

Not sure if that breaks anything....

[kkaefer]

Should be fine, just less explicit.