OptionWPE: Optimize binary size of debug build

This fix helps to build debug version of WPE for 32-bit RPi.
Unfortunately the build can be done only with at least -O1 (for 32-bit RPi).

Author: pgorszkowski-igalia

Source/cmake/OptionsWPE.cmake

@@ -460,4 +460,7 @@ if (COMPILER_IS_GCC_OR_CLANG AND UNIX AND NOT APPLE)
     set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}${CMAKE_COMPILER_SIZE_OPT_FLAGS} -ffunction-sections -fdata-sections")
     set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}${CMAKE_COMPILER_SIZE_OPT_FLAGS} -ffunction-sections -fdata-sections -fno-rtti")
     set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} -Wl,--gc-sections")
+    set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}${CMAKE_COMPILER_SIZE_OPT_FLAGS} -ffunction-sections -fdata-sections")
+    set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}${CMAKE_COMPILER_SIZE_OPT_FLAGS} -ffunction-sections -fdata-sections -fno-rtti")
+    set(CMAKE_SHARED_LINKER_FLAGS_DEBUG "${CMAKE_SHARED_LINKER_FLAGS_DEBUG} -Wl,--gc-sections")
 endif ()