TinyCC: Add compiler info for shared libs on Linux (#12605)

Use the "-shared" option to link shared libraries.  The compiler does
not support "-Wl," or "-rpath" but does know how to pass "-soname"
through to the linker.

Modules/Compiler/TinyCC-C.cmake

@@ -0,0 +1 @@
+SET(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-shared")

Modules/Platform/Linux-TinyCC-C.cmake

@@ -0,0 +1,4 @@
+SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG "")
+SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG_SEP "")
+SET(CMAKE_SHARED_LIBRARY_RPATH_LINK_C_FLAG "")
+SET(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG "-soname ")