libragephoto: set C standard by default to 99 and other changes

- CMakeLists.txt: set C standard by default to 99
- CMakeLists.txt: use generator expression for ICONV_LINKED
- RagePhotoConfig.h.in: update copyright year to 2025
- unicode.wasm: remove RAGEPHOTO_UNICODE_LIBS
- wasm.cmake: set C standard by default to 99

cmake/unicode.cmake

@@ -17,15 +17,11 @@
 ****************************************************************************]]
 
 set(RAGEPHOTO_UNICODE "" CACHE STRING "libragephoto Unicode implementation")
-set(RAGEPHOTO_UNICODE_LIBS "" CACHE STRING "libragephoto Unicode libraries")
 if (RAGEPHOTO_UNICODE)
     string(TOUPPER "UNICODE_${RAGEPHOTO_UNICODE}" UNICODE_DEF)
     list(APPEND LIBRAGEPHOTO_DEFINES
         ${UNICODE_DEF}
     )
-    list(APPEND LIBRAGEPHOTO_LIBS
-        ${RAGEPHOTO_UNICODE_LIBS}
-    )
     message("-- UnicodeCvt - ${RAGEPHOTO_UNICODE}")
 else()
     # RagePhoto test source files
@@ -92,11 +88,6 @@ else()
         list(APPEND LIBRAGEPHOTO_DEFINES
             UNICODE_ICONV
         )
-        if (ICONV_LINKED)
-            list(APPEND LIBRAGEPHOTO_LIBS
-                iconv
-            )
-        endif()
         message("-- UnicodeCvt - iconv")
     else()
         message("-- UnicodeCvt - none")

cmake/wasm.cmake

@@ -1,6 +1,6 @@
 #[[**************************************************************************
 * libragephoto RAGE Photo Parser
-* Copyright (C) 2023-2024 Syping
+* Copyright (C) 2023-2025 Syping
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
@@ -21,6 +21,8 @@ add_executable(ragephoto-wasm
     ${RAGEPHOTO_SOURCES}
 )
 set_target_properties(ragephoto-wasm PROPERTIES
+    C_STANDARD ${RAGEPHOTO_C_STANDARD}
+    C_STANDARD_REQUIRED ON
     CXX_STANDARD ${RAGEPHOTO_CXX_STANDARD}
     CXX_STANDARD_REQUIRED ON
     PREFIX "lib"