Recognize the Tiny C Compiler (#12605)

See compiler home page here:

  http://tinycc.org/
  http://bellard.org/tcc/

Use the id "TinyCC" as it appears in their online documentation.

Modules/CMakeCCompilerId.c.in

@@ -48,6 +48,9 @@
 #elif defined(__TI_COMPILER_VERSION__)
 # define COMPILER_ID "TI_DSP"
 
+#elif defined(__TINYC__)
+# define COMPILER_ID "TinyCC"
+
 #elif defined(__SCO_VERSION__)
 # define COMPILER_ID "SCO"