Autogenerated patch disabling the 32bit RISCV support
See https://gcc.gnu.org/PR90419

diff -ruN gcc-9.1.0.orig/gcc/config/riscv/t-linux-multilib gcc-9.1.0/gcc/config/riscv/t-linux-multilib
--- gcc-9.1.0.orig/gcc/config/riscv/t-linux-multilib	2017-02-06 22:38:37.000000000 +0100
+++ gcc-9.1.0/gcc/config/riscv/t-linux-multilib	2019-05-18 23:04:54.849400774 +0200
@@ -1,40 +1,18 @@
 # This file was generated by multilib-generator with the command:
-#  ./multilib-generator rv32imac-ilp32-rv32ima,rv32imaf,rv32imafd,rv32imafc,rv32imafdc- rv32imafdc-ilp32d-rv32imafd- rv64imac-lp64-rv64ima,rv64imaf,rv64imafd,rv64imafc,rv64imafdc- rv64imafdc-lp64d-rv64imafd-
-MULTILIB_OPTIONS = march=rv32imac/march=rv32ima/march=rv32imaf/march=rv32imafd/march=rv32imafc/march=rv32imafdc/march=rv32g/march=rv32gc/march=rv64imac/march=rv64ima/march=rv64imaf/march=rv64imafd/march=rv64imafc/march=rv64imafdc/march=rv64g/march=rv64gc mabi=ilp32/mabi=ilp32d/mabi=lp64/mabi=lp64d
-MULTILIB_DIRNAMES = rv32imac \
-rv32ima \
-rv32imaf \
-rv32imafd \
-rv32imafc \
-rv32imafdc \
-rv32g \
-rv32gc \
-rv64imac \
+#  ./multilib-generator rv64imac-lp64-rv64ima,rv64imaf,rv64imafd,rv64imafc,rv64imafdc- rv64imafdc-lp64d-rv64imafd-
+MULTILIB_OPTIONS = march=rv64imac/march=rv64ima/march=rv64imaf/march=rv64imafd/march=rv64imafc/march=rv64imafdc/march=rv64g/march=rv64gc mabi=lp64/mabi=lp64d
+MULTILIB_DIRNAMES = rv64imac \
 rv64ima \
 rv64imaf \
 rv64imafd \
 rv64imafc \
 rv64imafdc \
 rv64g \
-rv64gc ilp32 \
-ilp32d \
-lp64 \
+rv64gc lp64 \
 lp64d
-MULTILIB_REQUIRED = march=rv32imac/mabi=ilp32 \
-march=rv32imafdc/mabi=ilp32d \
-march=rv64imac/mabi=lp64 \
+MULTILIB_REQUIRED = march=rv64imac/mabi=lp64 \
 march=rv64imafdc/mabi=lp64d
-MULTILIB_REUSE = march.rv32imac/mabi.ilp32=march.rv32ima/mabi.ilp32 \
-march.rv32imac/mabi.ilp32=march.rv32imaf/mabi.ilp32 \
-march.rv32imac/mabi.ilp32=march.rv32imafd/mabi.ilp32 \
-march.rv32imac/mabi.ilp32=march.rv32imafc/mabi.ilp32 \
-march.rv32imac/mabi.ilp32=march.rv32imafdc/mabi.ilp32 \
-march.rv32imac/mabi.ilp32=march.rv32g/mabi.ilp32 \
-march.rv32imac/mabi.ilp32=march.rv32gc/mabi.ilp32 \
-march.rv32imafdc/mabi.ilp32d=march.rv32imafd/mabi.ilp32d \
-march.rv32imafdc/mabi.ilp32d=march.rv32gc/mabi.ilp32d \
-march.rv32imafdc/mabi.ilp32d=march.rv32g/mabi.ilp32d \
-march.rv64imac/mabi.lp64=march.rv64ima/mabi.lp64 \
+MULTILIB_REUSE = march.rv64imac/mabi.lp64=march.rv64ima/mabi.lp64 \
 march.rv64imac/mabi.lp64=march.rv64imaf/mabi.lp64 \
 march.rv64imac/mabi.lp64=march.rv64imafd/mabi.lp64 \
 march.rv64imac/mabi.lp64=march.rv64imafc/mabi.lp64 \
