Appease GCC strict prototypes warning (#3775)

product-mini/platforms/common/libc_wasi.c

@@ -28,7 +28,7 @@ typedef enum {
 } libc_wasi_parse_result_t;
 
 static void
-libc_wasi_print_help()
+libc_wasi_print_help(void)
 {
     printf("  --env=<env>              Pass wasi environment variables with "
            "\"key=value\"\n");

product-mini/platforms/nuttx/CMakeLists.txt

@@ -197,7 +197,7 @@ include(${WAMR_ROOT_DIR}/build-scripts/runtime_lib.cmake)
 # NuttX wamr lib complie required: `WAMR_SOURCES` `WAMR_CFLAGS` `WAMR_INCDIRS`
 # `WAMR_DEFINITIONS`
 set(WAMR_SOURCES ${WAMR_RUNTIME_LIB_SOURCE})
-set(WAMR_CFLAGS -Wno-strict-prototypes -Wno-shadow -Wno-unused-variable
+set(WAMR_CFLAGS -Wno-shadow -Wno-unused-variable
                 -Wno-int-conversion -Wno-implicit-function-declaration)
 get_directory_property(WAMR_INCDIRS INCLUDE_DIRECTORIES)
 get_directory_property(WAMR_DEFINITIONS COMPILE_DEFINITIONS)

product-mini/platforms/nuttx/wamr.mk

@@ -400,7 +400,7 @@ CFLAGS += -DWASM_ENABLE_EXCE_HANDLING=0
 CFLAGS += -DWASM_ENABLE_TAGS=0
 endif
 
-CFLAGS += -Wno-strict-prototypes -Wno-shadow -Wno-unused-variable
+CFLAGS += -Wno-shadow -Wno-unused-variable
 CFLAGS += -Wno-int-conversion -Wno-implicit-function-declaration
 
 CFLAGS += -I${CORE_ROOT} \

product-mini/platforms/posix/main.c

@@ -27,7 +27,7 @@ static char **app_argv;
 
 /* clang-format off */
 static int
-print_help()
+print_help(void)
 {
     printf("Usage: iwasm [-options] wasm_file [args...]\n");
     printf("options:\n");