Add compiler detection + optimizations

Added compiler detection:
TCC->Clang->GCC
Uses -O2 optimizations now
Uses -march=native by default, but by using
```make package```, it creates a distrobutable
binary instead.

Makefile

@@ -3,9 +3,19 @@
 
 VERSION = `git describe --tags --dirty 2>/dev/null || echo 0.2`
 PREFIX  = /usr/local
-CC      = cc
 PKG_CONFIG = pkg-config
 
+# Auto-detect compiler: TCC > Clang > GCC
+ifeq ($(shell which tcc 2>/dev/null),)
+  ifeq ($(shell which clang 2>/dev/null),)
+    CC = gcc
+  else
+    CC = clang
+  endif
+else
+  CC = tcc
+endif
+
 # Uncomment to build without XWayland support
 #XWAYLAND =
 #XLIBS =
@@ -18,7 +28,9 @@ PKGS    = wayland-server xkbcommon libinput $(LUA_PKG) $(XLIBS)
 CFLAGS   = `$(PKG_CONFIG) --cflags $(PKGS) wlroots-0.20` \
 	-I. -Iinclude -Isrc -Iparser -Iprotocols \
 	-DWLR_USE_UNSTABLE -D_POSIX_C_SOURCE=200809L -DVERSION=\"$(VERSION)\" \
-	$(XWAYLAND) -g -Wall -Wextra -Wno-unused-parameter -O1 -std=c11 $(CFLAGS)
+	$(XWAYLAND) -g -Wall -Wextra -Wno-unused-parameter -O2 $(MARCH) -std=c11 $(CFLAGS)
+
+MARCH = -march=native
 LDLIBS   = `$(PKG_CONFIG) --libs $(PKGS) wlroots-0.20` -lm $(LIBS)
 
 SMSG_CFLAGS = `$(PKG_CONFIG) --cflags wayland-client` -Wall -Wextra -Wno-unused-parameter
@@ -32,6 +44,9 @@ PROTO_OBJS = protocols/peachwm-ipc-unstable-v2-protocol.o \
 
 all: peachwm smsg/smsg
 
+package:
+	$(MAKE) MARCH=
+
 # Compositor
 
 peachwm: src/peachwm.o src/util.o parser/parser.o \