No rule to make target capstone.lib when compiling under MSYS2

[hipsterfont]

Minor bug in the Makefile I found while building QEMU. The IS_MINGW check in the Makefile fails under MSYS2 MinGW-w64 because cc --version doesn't have mingw in the output anymore:

$ whereis cc
cc: /mingw64/bin/cc.exe

$ cc --version
cc.exe (Rev2, Built by MSYS2 project) 8.3.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Really simple patch:

diff --git "a/Makefile" "b/Makefile"
index 063f50db..1d9f042e 100644
--- "a/Makefile"
+++ "b/Makefile"
@@ -288,7 +288,7 @@ CFLAGS := $(CFLAGS:-fPIC=)
 # On Windows we need the shared library to be executable
 else
 # mingw?
-IS_MINGW := $(shell $(CC) --version | grep -i mingw | wc -l)
+IS_MINGW := $(shell $(CC) --version | grep -i msys2 | wc -l)
 ifeq ($(IS_MINGW),1)
 EXT = dll
 AR_EXT = lib

[aquynh]

please send pull req, so i can merge.