configure: Use the environment variable CC when compiling tcc
configure: Use the environment variable CC when compiling tcc

Using the environment CC is a common used feature to
select a compiler to build any software,
so it should be supported when building tcc.

The old way using the parameter --cc still works.

Signed-off-by: Detlef Riekenberg <5b34c30a9957d3fa950a6a78115c5f5e8e9225f7@web.de>

mirror/tinycc,mirror/tinycc,mirror/tinycc,mirror/tinycc