Fix a possible library build problem

Signed-off-by: Gavin D. Howard <gavin@gavinhoward.com>

include/vm.h

@@ -560,9 +560,13 @@ typedef struct BcVm
 	/// The vector for creating strings to pass to the client.
 	BcVec out;
 
+#if BC_ENABLE_EXTRA_MATH
+
 	/// The PRNG.
 	BcRNG rng;
 
+#endif // BC_ENABLE_EXTRA_MATH
+
 	/// The current error.
 	BclError err;
 

src/library.c

@@ -217,10 +217,14 @@ bcl_init(void)
 	bc_vec_init(&vm->ctxts, sizeof(BclContext), BC_DTOR_NONE);
 	bc_vec_init(&vm->out, sizeof(uchar), BC_DTOR_NONE);
 
+#if BC_ENABLE_EXTRA_MATH
+
 	// We need to seed this in case /dev/random and /dev/urandom don't work.
 	srand((unsigned int) time(NULL));
 	bc_rand_init(&vm->rng);
 
+#endif // BC_ENABLE_EXTRA_MATH
+
 err:
 
 	BC_FUNC_FOOTER(vm, e);
@@ -285,7 +289,9 @@ bcl_free(void)
 	vm->refs -= 1;
 	if (vm->refs) return;
 
+#if BC_ENABLE_EXTRA_MATH
 	bc_rand_free(&vm->rng);
+#endif // BC_ENABLE_EXTRA_MATH
 	bc_vec_free(&vm->out);
 
 	for (i = 0; i < vm->ctxts.len; ++i)
@@ -1411,6 +1417,8 @@ bcl_string_keep(BclNumber n)
 	return bcl_string_helper(n, false);
 }
 
+#if BC_ENABLE_EXTRA_MATH
+
 static BclNumber
 bcl_irand_helper(BclNumber a, bool destruct)
 {
@@ -1755,4 +1763,6 @@ bcl_rand_bounded(BclRandInt bound)
 	return (BclRandInt) bc_rand_bounded(&vm->rng, (BcRand) bound);
 }
 
+#endif // BC_ENABLE_EXTRA_MATH
+
 #endif // BC_ENABLE_LIBRARY

src/vm.c

@@ -643,12 +643,14 @@ bc_vm_shutdown(void)
 	if (vm->catalog != BC_VM_INVALID_CATALOG) catclose(vm->catalog);
 #endif // BC_ENABLE_NLS
 
+#if !BC_ENABLE_LIBRARY
 #if BC_ENABLE_HISTORY
 	// This must always run to ensure that the terminal is back to normal, i.e.,
 	// has raw mode disabled. But we should only do it if we did not have a bad
 	// terminal because history was not initialized if it is a bad terminal.
 	if (BC_TTY && !vm->history.badTerm) bc_history_free(&vm->history);
 #endif // BC_ENABLE_HISTORY
+#endif // !BC_ENABLE_LIBRARY
 
 #if BC_DEBUG
 #if !BC_ENABLE_LIBRARY