Fix linker to enable successful builds of the --winuwp target (flutter#438)

Author: clarkezone

build/config/BUILD.gn

@@ -109,12 +109,9 @@ config("default_libs") {
     libs = [
       "advapi32.lib",
       "comdlg32.lib",
-      "dbghelp.lib",
       "delayimp.lib",
       "dnsapi.lib",
-      "gdi32.lib",
       "iphlpapi.lib",
-      "kernel32.lib",
       "msimg32.lib",
       "odbc32.lib",
       "odbccp32.lib",
@@ -124,8 +121,6 @@ config("default_libs") {
       "shell32.lib",
       "shlwapi.lib",
       "Rpcrt4.lib",
-      "user32.lib",
-      "usp10.lib",
       "uuid.lib",
       "version.lib",
       "wininet.lib",

build/secondary/third_party/swiftshader_flutter/BUILD.gn

@@ -32,6 +32,8 @@ config("internal_config") {
       "/wd4800",
       "/wd5030",
     ]
+
+    libs = [ "user32.lib", "gdi32.lib" ]
   } else {
     cflags = [
       "-Wno-header-hygiene",