Fix MUSL static linking by disabling glibc fortification

- Add -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0 to CFLAGS
- Prevents __snprintf_chk and __fprintf_chk symbol errors
- Required for Alpine Linux / MUSL static builds
- Maintains compatibility with glibc builds

build.sh

@@ -530,7 +530,8 @@ for nip in $NEEDED_NIPS; do
 done
 
 # Build flags
-CFLAGS="-Wall -Wextra -std=c99 -fPIC -O2"
+# Disable fortification for MUSL compatibility (prevents __*_chk symbol issues)
+CFLAGS="-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0 -Wall -Wextra -std=c99 -fPIC -O2"
 CFLAGS="$CFLAGS -DENABLE_FILE_LOGGING -DENABLE_WEBSOCKET_LOGGING -DENABLE_DEBUG_LOGGING"
 INCLUDES="-I. -Inostr_core -Inostr_core/crypto -Icjson -Inostr_websocket"