build: remove GCC7 support
-rw-r--r-- 8 .gitattributes
drwxr-xr-x - .github
-rw-r--r-- 278 .gitignore
-rw-r--r-- 106 BSDmakefile
-rw-r--r-- 284 COPYING
-rw-r--r-- 502 Config.in
drwxr-xr-x - LICENSES
-rw-r--r-- 3831 Makefile
-rw-r--r-- 3467 README.md
drwxr-xr-x - config
-rw-r--r-- 442 feeds.conf.default
drwxr-xr-x - include
drwxr-xr-x - package
-rw-r--r-- 14739 rules.mk
drwxr-xr-x - scripts
drwxr-xr-x - target
drwxr-xr-x - toolchain
drwxr-xr-x - tools