New comment by avoidr on void-packages repository

https://github.com/void-linux/void-packages/pull/19928#issuecomment-599136141

Comment:
I've added a patch now, to let the CC be overriden by what `xbps-src` wants. But now apparently the environment gets clobbered and headers/dependencies are no longer found.

This was my patch:
```
--- Makefile.in~	2020-03-14 10:55:04.950418920 +0100
+++ Makefile.in	2020-03-14 20:12:10.715364752 +0100
@@ -32,7 +32,7 @@
 default: src/Makefile
 	- mkdir -p $(BUILD_DIR)
 	$(MAKE) -C data resources
-	$(MAKE) -C src
+	$(MAKE) -C src -e
 
 .PHONY: install
 install: install-bin install-data install-po
```