configure: --config-musl/-uClibc switch & misc cleanups

- configure:
  - add --config-uClibc,-musl switch and suggest to use
    it if uClibc/musl is detected
  - make warning options magic clang compatible
  - simplify (use $confvars instead of individual options)
- Revert "Remove some unused-parameter lint"
  7443db0d5f841b81a55e918bf8c228dd20f9ddb2
  rather use -Wno-unused-parameter (or just not -Wextra)
- #ifdef functions that are unused on some targets
- tccgen.c: use PTR_SIZE==8 instead of (X86_64 || ARM64)
- tccpe.c: fix some warnings
- integrate dummy arm-asm better

1 files changed, 0 insertions, 1 deletions

diff --git a/tccpp.c b/tccpp.c
index ed8b81d..d70ddd6 100644
--- a/tccpp.c
+++ b/tccpp.c
@@ -3557,7 +3557,6 @@ ST_FUNC void tccpp_delete(TCCState *s)
 {
     int i, n;
 
-    (void) s;  /* not used */
     /* free -D and compiler defines */
     free_defines(NULL);