gcc: update to 7.1 with tools * src/build-gcc.mk: update version 7.1.0 * src/cloog.mk: update 0.18.4 * src/gmp.mk: update 6.1.2 * src/isl.mk: update 0.16.1, add no-undefined flag * src/mpfr.mk: update 3.1.6 * src/native-gcc.mk: update 7.1.0 * src/isl-1-fixes.patch: removed file * dist-files.mk: remove reference to patch files, add mingw-w64 patch * src/build-gcc-1-mingw-float.patch: removed patch * src/native-gcc-1-mingw-float.patch: removed patch * src/build-gcc-2-intrinsics.patch: removed patch * src/native-gcc-2-intrinsics.patch: removed patch * src/mingw-w64.mk: update to 5.0.2 * src/gcc-1-mingw-float.patch: remove patch * src/gcc-2-darwin-no-pie.patch: remove patch * src/mingw-w64-2-pthreads.patch: new file * src/pthreads.mk: apply mingw patches to mingw sources before running configure

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diff -urN aubio-0.3.2.orig/configure.ac aubio-0.3.2/configure.ac
--- aubio-0.3.2.orig/configure.ac	2006-10-09 01:11:39.000000000 +0200
+++ aubio-0.3.2/configure.ac	2010-01-26 23:07:23.000000000 +0100
@@ -135,9 +135,6 @@
             [Defined when c99 style varargs macros are supported])
 fi
 
-dnl Check for pkg-config
-AC_PATH_PROG(PKG_CONFIG,pkg-config,no)
-
 PKG_CHECK_MODULES(SNDLIB,     sndfile >= 1.0.4,       SNDLIB_SUPPORT=1)
 PKG_CHECK_MODULES(SAMPLERATE, samplerate  >= 0.0.15,  SAMPLERATE_SUPPORT=1)