Unified CMake-based build system

See #56 for discussion.

Fixes #21, Fixes #29, Fixes #37, Closes #56, Fixes #58, Closes #73
Obviates #82

See also:
https://sourceforge.net/p/libjpeg-turbo/feature-requests/5/
https://sourceforge.net/p/libjpeg-turbo/patches/5/

win/jconfig.h.in

@@ -1,35 +1,24 @@
-/* jconfig.vc --- jconfig.h for Microsoft Visual C++ on Windows 95 or NT. */
-/* see jconfig.txt for explanations */
-
 #define JPEG_LIB_VERSION @JPEG_LIB_VERSION@
 #define LIBJPEG_TURBO_VERSION @VERSION@
 #define LIBJPEG_TURBO_VERSION_NUMBER @LIBJPEG_TURBO_VERSION_NUMBER@
+
 #cmakedefine C_ARITH_CODING_SUPPORTED
 #cmakedefine D_ARITH_CODING_SUPPORTED
 #cmakedefine MEM_SRCDST_SUPPORTED
-
-/*
- * Define BITS_IN_JSAMPLE as either
- *   8   for 8-bit sample values (the usual setting)
- *   12  for 12-bit sample values
- * Only 8 and 12 are legal data precisions for lossy JPEG according to the
- * JPEG standard, and the IJG code does not support anything else!
- * We do not support run-time selection of data precision, sorry.
- */
+#cmakedefine WITH_SIMD
 
 #define BITS_IN_JSAMPLE  @BITS_IN_JSAMPLE@      /* use 8 or 12 */
 
-#define HAVE_UNSIGNED_CHAR
-#define HAVE_UNSIGNED_SHORT
-/* #define void char */
-/* #define const */
-#undef __CHAR_UNSIGNED__
 #define HAVE_STDDEF_H
 #define HAVE_STDLIB_H
-#undef NEED_BSD_STRINGS
 #undef NEED_SYS_TYPES_H
-#undef NEED_FAR_POINTERS	/* we presume a 32-bit flat memory model */
+#undef NEED_BSD_STRINGS
+
+#define HAVE_UNSIGNED_CHAR
+#define HAVE_UNSIGNED_SHORT
 #undef INCOMPLETE_TYPES_BROKEN
+#undef RIGHT_SHIFT_IS_UNSIGNED
+#undef __CHAR_UNSIGNED__
 
 /* Define "boolean" as unsigned char, not int, per Windows custom */
 #ifndef __RPCNDR_H__		/* don't conflict if rpcndr.h already read */
@@ -43,9 +32,3 @@ typedef short INT16;
 typedef signed int INT32;
 #endif
 #define XMD_H                   /* prevent jmorecfg.h from redefining it */
-
-#ifdef JPEG_INTERNALS
-
-#undef RIGHT_SHIFT_IS_UNSIGNED
-
-#endif /* JPEG_INTERNALS */

win/jconfigint.h.in

@@ -1,13 +0,0 @@
-#define VERSION "@VERSION@"
-#define BUILD "@BUILD@"
-#define PACKAGE_NAME "@CMAKE_PROJECT_NAME@"
-
-#ifndef INLINE
-#if defined(__GNUC__)
-#define INLINE inline __attribute__((always_inline))
-#elif defined(_MSC_VER)
-#define INLINE __forceinline
-#else
-#define INLINE
-#endif
-#endif

win/jsimdcfg.inc

@@ -91,5 +91,3 @@
 %define JSIMD_SSE 0x04
 %define JSIMD_SSE2 0x08
 %define JSIMD_AVX2 0x80
-; Short forms of external names for systems with brain-damaged linkers.
-;