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firmware/Makefile: remove -Wredundant-decls

picolibc has redundant declarations of free and strdtold, which results
in lots of warnings with -Wredundant-decls. Adjust CFLAGS to remove
-Wredundant-decls to make the compiler log more readable.

  /usr/lib/picolibc/arm-none-eabi/include/stdlib.h:147:9: warning: redundant redeclaration of 'free' [-Wredundant-decls]
    147 | void    free (void *) __nothrow;
        |         ^~~~
  /usr/lib/picolibc/arm-none-eabi/include/stdlib.h:99:9: note: previous declaration of 'free' with type 'void(void *)'
     99 | void    free (void *) __nothrow;
        |         ^~~~
  /usr/lib/picolibc/arm-none-eabi/include/stdlib.h:307:9: warning: redundant redeclaration of 'strtold' [-Wredundant-decls]
    307 |         strtold (const char *__restrict, char **__restrict);
        |         ^~~~~~~
  /usr/lib/picolibc/arm-none-eabi/include/stdlib.h:286:9: note: previous declaration of 'strtold' with type 'long double(const char * restrict,  char ** restrict)'
    286 |         strtold (const char *__restrict __n, char **__restrict __end_PTR);
        |         ^~~~~~~

Change-Id: I32ff78f2a27191d1c6e114429d2e0713674732fe
---
M firmware/Makefile
1 file changed, 1 insertion(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/simtrace2 refs/changes/69/42769/1

diff --git a/firmware/Makefile b/firmware/Makefile
index 13f6bd2..7692885 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -186,7 +186,7 @@
 CFLAGS += -Waggregate-return #-Wsign-compare
 CFLAGS += -Wmissing-format-attribute -Wno-deprecated-declarations
 CFLAGS += #-Wpacked
-CFLAGS += -Wredundant-decls -Wnested-externs #-Winline -Wlong-long
+CFLAGS += -Wnested-externs #-Winline -Wlong-long -Wredundant-decls
 CFLAGS += -Wunreachable-code
 #CFLAGS += -Wcast-align
 #CFLAGS += -std=c11

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