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TI: set C90 and C99 compile options

Arnaud Gelas requested to merge arnaudgelas/cmake:fix-ti-c-standard into master 
Section 1.3 ANSI/ISO Standard:

The compiler supports both the 1989 and 1999 versions of the C language and the
2003 version of the C++ language. The C and C++ language features in the
compiler are implemented in conformance with the following ISO standards:

+ ISO-standard C The C compiler supports the 1989 and 1999 versions of the C
language.

  – C89. Compiling with the --c89 option causes the compiler to conform to the
ISO/IEC 9899:1990 C standard, which was previously ratified as ANSI
X3.159-1989. The names "C89" and "C90" refer to the same programming language.
"C89" is used in this document.

  – C99. Compiling with the --c99 option causes the compiler to conform to the
ISO/IEC 9899:1999 C standard. This standard supports several features not part
of C89, such as inline functions, new data types, and one-line comments
beginning with //.

The C language is also described in the second edition of Kernighan and
Ritchie's The C Programming Language (K&R).

Section 6.14.1 Extensions:

Most of the GCC language extensions are available in the TI compiler when
compiling in relaxed ANSI mode (--relaxed_ansi).

Fixes: #18061 (closed)

Edited by Brad King

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