cgen: fix building on Termux after fa904c4

Author: spytheman

vlib/v/gen/c/cheaders.v

@@ -336,6 +336,12 @@ typedef int (*qsort_callback_func)(const void*, const void*);
 
 #include <stdarg.h> // for va_list
 
+#ifdef __TERMUX__
+#if __BIONIC_AVAILABILITY_GUARD(28)
+#else
+void * aligned_alloc(size_t alignment, size_t size) { return malloc(size); }
+#endif
+#endif
 //================================== GLOBALS =================================*/
 int load_so(byteptr);
 void _vinit(int ___argc, voidptr ___argv);