mbedtls error when compiling to Android

[DigiEggz]

When targeting Android on macOS, I receive the following error:

Error: /Users/E/Documents/Haxe/hxcpp/4,3,12/project/thirdparty/mbedtls-2.28.2/library/bignum.c: In function 'mpi_select':

/Users/E/Documents/Haxe/hxcpp/4,3,12/project/thirdparty/mbedtls-2.28.2/library/bignum.c:1990:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for( size_t i = 0; i < T_size; i++ )
     ^
/Users/E/Documents/Haxe/hxcpp/4,3,12/project/thirdparty/mbedtls-2.28.2/library/bignum.c:1990:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code

I'm willing to test any suggested fixes.

Edit: May be necessary to update the mbedtls library.

[DigiEggz]

For anyone else having this issue, a fix is to include the compiler flag <compilerflag value="-std=c99" unless="MSVC_VER" /> within src/hx/libs/ssl/Build.xml, like used in #1041.

Ideally the entire mbedtls library within hxcpp will be updated, but it will also require the C99 fix. For more info, see this issue.