Replace weak symbols with strong to workaround an issue with tcc -ar
This won't be necessary once we can rebuild with ar from binutils.
--- src/include/features.h	2021-02-02 23:15:42.791932948 +0000
+++ src/include/features.h	2021-02-02 23:17:21.394647015 +0000
@@ -6,6 +6,6 @@
 #define weak __attribute__((__weak__))
 #define hidden __attribute__((__visibility__("hidden")))
 #define weak_alias(old, new) \
-	extern __typeof(old) new __attribute__((__weak__, __alias__(#old)))
+	extern __typeof(old) new __attribute__((/*__weak__, */__alias__(#old)))
 
 #endif