cmake: fix pkgconfig and cmake interaction

Issue #454

CMakeLists.txt

@@ -207,8 +207,10 @@ if(MSVC AND USE_STATIC_MSVC_RUNTIME)
     endforeach()
 endif()
 
-# Configure pkg-config
-find_package(PkgConfig)
+if(NOT MSVC)
+    find_package(PkgConfig)
+endif()
+
 file(READ "include/xlsxwriter.h" ver)
 
 string(REGEX MATCH "LXW_VERSION \"([^\"]+)\"" _ ${ver})
@@ -228,7 +230,8 @@ list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
 if(PKG_CONFIG_FOUND)
     pkg_check_modules(ZLIB zlib)
     list(APPEND LXW_PRIVATE_INCLUDE_DIRS ${ZLIB_INCLUDE_DIRS})
-else(NOT ZLIB_FOUND)
+endif()
+if(NOT ZLIB_FOUND)
     find_package(ZLIB "1.0" REQUIRED)
     list(APPEND LXW_PRIVATE_INCLUDE_DIRS ${ZLIB_INCLUDE_DIRS})
     message("zlib version: " ${ZLIB_VERSION})
@@ -239,7 +242,8 @@ if(USE_SYSTEM_MINIZIP)
     if(PKG_CONFIG_FOUND)
         pkg_check_modules(MINIZIP minizip)
         list(APPEND LXW_PRIVATE_INCLUDE_DIRS ${MINIZIP_INCLUDE_DIRS}/..)
-    else(NOT MINIZIP_FOUND)
+    endif()
+    if(NOT MINIZIP_FOUND)
         find_package(MINIZIP "1.0" REQUIRED)
         list(APPEND LXW_PRIVATE_INCLUDE_DIRS ${MINIZIP_INCLUDE_DIRS})
     endif()
@@ -288,7 +292,7 @@ if(USE_OPENSSL_MD5)
     if(PKG_CONFIG_FOUND)
         pkg_check_modules(LIBCRYPTO libcrypto)
         include_directories(${LIBCRYPTO_INCLUDE_DIRS})
-    else(NOT LIBCRYPTO_FOUND)
+    else()
         find_package(OpenSSL REQUIRED)
         include_directories(${OPENSSL_INCLUDE_DIR})
         message(STATUS "OpenSSL version: ${OPENSSL_VERSION}")