Use precompiled curl library, instead of system curl-gnutls.

Solves some issues with missing libraries at runtime on my system. If
we're going to run this under a steam runtime, this commit can be removed

Author: ReplayCoding

src/engine/engine.vpc

@@ -40,7 +40,7 @@ $Configuration
 		$AdditionalLibraryDirectories	"$BASE;$SRCDIR\lib\common\vc7;$SRCDIR\dx9sdk\lib" [$WINDOWS]
 		$SystemFrameworks				"Carbon;AppKit;OpenAL;CoreAudio;AudioToolbox;SystemConfiguration;Quicktime;AudioUnit" [$OSXALL]
 		$SystemLibraries				"iconv" [$OSXALL]
-		$SystemLibraries				"rt;openal;curl-gnutls" [$LINUXALL]
+		$SystemLibraries				"rt;openal" [$LINUXALL]
 		$GCC_ExtraLinkerFlags			"-L/usr/lib32 -L/usr/lib" [$LINUXALL]
 	}
 }
@@ -1113,6 +1113,7 @@ $Project "engine"
 		$ImpLibexternal steam_api
 
 		$ImpLib	"$LIBCOMMON\curl"	  [$OSXALL]
+		$Lib	"$LIBCOMMON\libcurl"	  [$LINUXALL]
 
 		$Libexternal	"libz"
 		$Libexternal 	"$SRCDIR\lib\common\$(CRYPTOPPDIR)\libcrypto" [$LINUXALL&&!$DEDICATED]

src/replay/replay.vpc

@@ -36,7 +36,6 @@ $Configuration
 		$SystemLibraries			"iconv;z" [$OSXALL]		
 
 		$SystemLibraries			"rt;"	[$LINUXALL]
-		$SystemLibraries			"$BASE;curl-gnutls"	[$LINUXALL]
 
 		$AdditionalDependencies		"$BASE ws2_32.lib" [$WINDOWS]
 	}
@@ -205,6 +204,7 @@ $Project "replay"
 		$Libexternal $LIBCOMMON/libpng [$VS2015]
 
 		$ImpLib	"$LIBCOMMON\curl"	  [$OSXALL]
+		$Lib	"$LIBCOMMON\libcurl"	  [$LINUXALL]
 
 		$Lib	"$LIBCOMMON\libcurl" [$WIN32&&!$VS2015]
 		$Lib   "libz" [$WIN32]