Add GCC to compiler check

Author: JCGoran

src/CMakeLists.txt

@@ -4,7 +4,7 @@ set(GGML_SOURCES_BITNET ggml-bitnet-lut.cpp)
 
 include_directories(3rdparty/llama.cpp/ggml/include)
 
-if ((NOT ${CMAKE_C_COMPILER_ID} MATCHES "Clang") OR
-(NOT ${CMAKE_CXX_COMPILER_ID} MATCHES "Clang"))
-    message(FATAL_ERROR "Clang is required for Bitnet.cpp compilation")
-endif()
+if (NOT (CMAKE_C_COMPILER_ID MATCHES "Clang" OR CMAKE_C_COMPILER_ID STREQUAL "GNU") OR
+    NOT (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "GNU"))
+    message(FATAL_ERROR "Clang or GCC is required for Bitnet.cpp compilation")
+endif()