rm regex.a from adapter target, it's not required

pEpMacOSAdapter.xcodeproj/project.pbxproj

@@ -7,7 +7,6 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
-		150D91D2254732B600010463 /* libboost_regex.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 150D91D1254732B600010463 /* libboost_regex.a */; };
 		150D91D5254732E800010463 /* libcryptopp.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 150D91D4254732E800010463 /* libcryptopp.a */; };
 		150D91D72547330100010463 /* libcrypto.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 150D91D62547330100010463 /* libcrypto.a */; };
 		150D91D92547331D00010463 /* libssl.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 150D91D82547331D00010463 /* libssl.a */; };
@@ -27,7 +26,6 @@
 		35380AE6247BD13A004A08A6 /* README.md */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = net.daringfireball.markdown; path = README.md; sourceTree = SOURCE_ROOT; };
 		35380AE8247C784E004A08A6 /* pEpUpdater.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = pEpUpdater.h; sourceTree = "<group>"; };
 		35380AE9247C784E004A08A6 /* pEpUpdater.mm */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; path = pEpUpdater.mm; sourceTree = "<group>"; };
-		35BE8E4424856B9B006038C4 /* Subscriber.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = Subscriber.h; sourceTree = "<group>"; };
 		35DC18D2244DA19100FB2002 /* foundation.pEp.adapter.macOS.xpc */ = {isa = PBXFileReference; explicitFileType = "wrapper.xpc-service"; includeInIndex = 0; path = foundation.pEp.adapter.macOS.xpc; sourceTree = BUILT_PRODUCTS_DIR; };
 		35DC18D5244DA19100FB2002 /* pEpMacOSAdapterProtocol.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = pEpMacOSAdapterProtocol.h; sourceTree = "<group>"; };
 		35DC18D6244DA19100FB2002 /* pEpMacOSAdapter.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = pEpMacOSAdapter.h; sourceTree = "<group>"; };
@@ -42,7 +40,6 @@
 			buildActionMask = 2147483647;
 			files = (
 				15CC85A72546D71A00DC43A1 /* libdownloadclient.a in Frameworks */,
-				150D91D2254732B600010463 /* libboost_regex.a in Frameworks */,
 				150D91D5254732E800010463 /* libcryptopp.a in Frameworks */,
 				150D91D72547330100010463 /* libcrypto.a in Frameworks */,
 				150D91D92547331D00010463 /* libssl.a in Frameworks */,
@@ -78,7 +75,6 @@
 				35DC18D7244DA19100FB2002 /* pEpMacOSAdapter.m */,
 				35380AE8247C784E004A08A6 /* pEpUpdater.h */,
 				35380AE9247C784E004A08A6 /* pEpUpdater.mm */,
-				35BE8E4424856B9B006038C4 /* Subscriber.h */,
 				35DC18D9244DA19100FB2002 /* main.m */,
 				35DC18DB244DA19100FB2002 /* Info.plist */,
 			);