Only build conio-snake if the C++ compiler is functional.

examples/Makefile.am

@@ -2,7 +2,11 @@
 
 AM_CPPFLAGS = -I$(top_srcdir) -I$(top_srcdir)/caca -I$(top_builddir)/caca
 
-noinst_PROGRAMS = blit canvas colors conio conio-snake demo demo0 dithering driver event export figfont font font2tga frames fullwidth gamma hsv input spritedit swallow text transform truecolor unicode import
+noinst_PROGRAMS = blit canvas colors conio $(conio_snake) demo demo0 dithering driver event export figfont font font2tga frames fullwidth gamma hsv input spritedit swallow text transform truecolor unicode import
+
+if USE_CXX
+conio_snake = conio-snake
+endif
 
 blit_SOURCES = blit.c
 blit_LDADD = ../caca/libcaca.la