fix: only add version.rc for MSVC

We fail to build the shared library in the MINGW platform because we
don't have verrsrc.h header in the MINGW toolchain. To prevent this
issue, we only add version.rc file when we build with MSVC.

Resolves #102

src/CMakeLists.txt

@@ -62,7 +62,7 @@ endif()
 
 add_definitions(-D_XOPEN_SOURCE=700)
 
-if(BUILD_SHARED_LIBS AND WIN32)
+if(BUILD_SHARED_LIBS AND (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC"))
   set(COMPANY_NAME "The Argtable3 Project")
   set(FILE_DESC "ANSI C command-line parsing library")
   set(INTERNAL_NAME "${PROJECT_NAME}")