iOS: update deployment target

newer glslang versions require newer C++ features than the old target supported.

platform/xcode/liblove.xcodeproj/project.pbxproj

@@ -5513,7 +5513,7 @@
 					"\"$(SRCROOT)/../../src/modules\"",
 					"\"$(SRCROOT)/../../src/libraries/enet/libenet/include\"",
 				);
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LIBRARY_SEARCH_PATHS = "";
 				MACOSX_DEPLOYMENT_TARGET = 10.13;
 				ONLY_ACTIVE_ARCH = NO;
@@ -5579,7 +5579,7 @@
 					"\"$(SRCROOT)/../../src/modules\"",
 					"\"$(SRCROOT)/../../src/libraries/enet/libenet/include\"",
 				);
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LIBRARY_SEARCH_PATHS = "";
 				MACOSX_DEPLOYMENT_TARGET = 10.13;
 				ONLY_ACTIVE_ARCH = YES;
@@ -5717,7 +5717,7 @@
 					"\"$(SRCROOT)/../../src/modules\"",
 					"\"$(SRCROOT)/../../src/libraries/enet/libenet/include\"",
 				);
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LIBRARY_SEARCH_PATHS = "";
 				LLVM_LTO = YES;
 				MACOSX_DEPLOYMENT_TARGET = 10.13;

platform/xcode/love.xcodeproj/project.pbxproj

@@ -562,7 +562,7 @@
 					"\"$(SRCROOT)/../../src/modules\"",
 				);
 				INFOPLIST_FILE = "love-Info.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "@loader_path/../Frameworks";
 				MACOSX_DEPLOYMENT_TARGET = 10.13;
 				ONLY_ACTIVE_ARCH = YES;
@@ -637,7 +637,7 @@
 					"\"$(SRCROOT)/../../src/modules\"",
 				);
 				INFOPLIST_FILE = "love-Info.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "@loader_path/../Frameworks";
 				LLVM_LTO = YES;
 				MACOSX_DEPLOYMENT_TARGET = 10.13;
@@ -871,7 +871,7 @@
 					"\"$(SRCROOT)/../../src/modules\"",
 				);
 				INFOPLIST_FILE = "love-Info.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "@loader_path/../Frameworks";
 				LLVM_LTO = YES;
 				MACOSX_DEPLOYMENT_TARGET = 10.13;