fix(build): test_pipe_block references glm.c, renamed to colibri.c by #391

The #270 rebase resolved the TEST_BINS list but missed the test_pipe_block
rule prerequisite and its #include, both still pointing at glm.c (which #391
renamed to colibri.c) — 'No rule to make target glm.c' broke the Linux C test
suite on dev. Point both at colibri.c. Build-verified locally.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

c/tests/test_pipe_block.c

@@ -19,7 +19,7 @@
 #include <string.h>
 #include <unistd.h>
 #define main coli_glm_main_unused
-#include "../glm.c"
+#include "../colibri.c"
 #undef main
 
 static int fail(const char *s){ fprintf(stderr,"FAIL: %s\n",s); return 1; }