remove broken gcc 6.2.0 powerpc patch

this patch breaks powerpc64 builds and is not necessary to produce a
working 32-bit powerpc toolchain. it seems like it may be useful for
reducing libgcc-internal bloat, but it can be reintroduced later after
it's fixed, if desired.

patches/gcc-6.2.0/0007-libgcc-Add-knob-to-use-ldbl-128-on-ppc.diff

@@ -1,99 +0,0 @@
-diff --git a/libgcc/Makefile.in b/libgcc/Makefile.in
-index f09b39b..296cf0f 100644
---- a/libgcc/Makefile.in
-+++ b/libgcc/Makefile.in
-@@ -43,6 +43,7 @@ enable_vtable_verify = @enable_vtable_verify@
- enable_decimal_float = @enable_decimal_float@
- fixed_point = @fixed_point@
- with_aix_soname = @with_aix_soname@
-+with_ldbl128 = @with_ldbl128@
- 
- host_noncanonical = @host_noncanonical@
- real_host_noncanonical = @real_host_noncanonical@
-diff --git a/libgcc/config/rs6000/t-linux b/libgcc/config/rs6000/t-linux
-index 4f6d4c4..c50dd94 100644
---- a/libgcc/config/rs6000/t-linux
-+++ b/libgcc/config/rs6000/t-linux
-@@ -1,3 +1,6 @@
- SHLIB_MAPFILES += $(srcdir)/config/rs6000/libgcc-glibc.ver
- 
--HOST_LIBGCC2_CFLAGS += -mlong-double-128 -mno-minimal-toc
-+ifeq ($(with_ldbl128),yes)
-+HOST_LIBGCC2_CFLAGS += -mlong-double-128
-+endif
-+HOST_LIBGCC2_CFLAGS += -mno-minimal-toc
-diff --git a/libgcc/configure b/libgcc/configure
-old mode 100644
-new mode 100755
-index e7d6c75..e9a9019
---- a/libgcc/configure
-+++ b/libgcc/configure
-@@ -614,6 +614,7 @@ build_vendor
- build_cpu
- build
- with_aix_soname
-+with_ldbl128
- enable_vtable_verify
- enable_shared
- libgcc_topdir
-@@ -663,6 +664,7 @@ with_cross_host
- with_ld
- enable_shared
- enable_vtable_verify
-+with_long_double_128
- with_aix_soname
- enable_version_specific_runtime_libs
- with_slibdir
-@@ -1319,6 +1321,7 @@ Optional Packages:
-   --with-target-subdir=SUBDIR      Configuring in a subdirectory for target
-   --with-cross-host=HOST           Configuring with a cross compiler
-   --with-ld               arrange to use the specified ld (full pathname)
-+  --with-long-double-128  use 128-bit long double by default
-   --with-aix-soname=aix|svr4|both
-                           shared library versioning (aka "SONAME") variant to
-                           provide on AIX
-@@ -2201,6 +2204,21 @@ fi
- 
- 
- 
-+# Check whether --with-long-double-128 was given.
-+if test "${with_long_double_128+set}" = set; then :
-+  withval=$with_long_double_128; with_ldbl128="$with_long_double_128"
-+else
-+  case "${host}" in
-+ power*-*-musl*)
-+   with_ldbl128="no";;
-+ *) with_ldbl128="yes";;
-+ esac
-+
-+fi
-+
-+
-+
-+
- # Check whether --with-aix-soname was given.
- if test "${with_aix_soname+set}" = set; then :
-   withval=$with_aix_soname; case "${host}:${enable_shared}" in
-diff --git a/libgcc/configure.ac b/libgcc/configure.ac
-index 269997f..81dc3ba 100644
---- a/libgcc/configure.ac
-+++ b/libgcc/configure.ac
-@@ -77,6 +77,18 @@ AC_ARG_ENABLE(vtable-verify,
- [enable_vtable_verify=no])
- AC_SUBST(enable_vtable_verify)
- 
-+AC_ARG_WITH(long-double-128,
-+[AS_HELP_STRING([--with-long-double-128],
-+    [use 128-bit long double by default])],
-+      with_ldbl128="$with_long_double_128",
-+[case "${host}" in
-+ power*-*-musl*)
-+   with_ldbl128="no";;
-+ *) with_ldbl128="yes";;
-+ esac
-+])
-+AC_SUBST(with_ldbl128)
-+
- AC_ARG_WITH(aix-soname,
- [AS_HELP_STRING([--with-aix-soname=aix|svr4|both],
-     [shared library versioning (aka "SONAME") variant to provide on AIX])],