Added a gcc preprocessor options -P, -P1

tcc -E -P
  do not output a #line directive, a gcc compatible option

tcc -E -P1
  don't follow a gcc preprocessor style and do output a standard
  #line directive. In such case we don't lose a location info when
  we going to compile a resulting file wtith a compiler not
  understanding a gnu style line info.

tcc.c

@@ -45,6 +45,8 @@ static void help(void)
            "  -Idir       add include path 'dir'\n"
            "  -Dsym[=val] define 'sym' with value 'val'\n"
            "  -Usym       undefine 'sym'\n"
+           "  -P          do not output a #line directive\n"
+           "  -P1         use a #line directive in output instead of the gcc style\n"
            "Linker options:\n"
            "  -Ldir       add library path 'dir'\n"
            "  -llib       link with dynamic or static library 'lib'\n"