Fix #4, issue when using space in path

C compiler must be called with -cixxx option. If xxx contains spaces, it
must be called with -ci"xxx". When using this double quote solution and
space between c and i, this is the case. Else the space in xxx is interpreted
as a separator.

Author: VVESTM

platform.txt

@@ -36,7 +36,7 @@ compiler.extra_flags=-gh -si -sd +proto +split
 compiler.c.flags= {compiler.extra_flags} -I "{compiler.path}\hstm8" -I "{compiler.path}\hstm8++" {compiler.stm.extra_include}
 compiler.c.sm8.flags=
 compiler.S.flags=
-compiler.cpp.flags= {compiler.extra_flags} -I "{compiler.path}\hstm8++" -c"i{compiler.path}\hstm8" {compiler.stm.extra_include} {compiler.warning_flags}
+compiler.cpp.flags= {compiler.extra_flags} -I "{compiler.path}\hstm8++" -c 'i"{compiler.path}\hstm8"' {compiler.stm.extra_include} {compiler.warning_flags}
 compiler.ar.flags=-e -r -p
 compiler.sm82hex.flags=-fi
 compiler.hex2bin.flags=-b