odk: fix 32-bit Linux build on 64-bit OS

In this situation gcc/g++ will default to x86_64, so pass the "-m32"
flag to produce x86 binaries.

Change-Id: Ie31cd4240e353db606621cb03107ce03a74cfbef
(cherry picked from commit 71d7532f)
Reviewed-on: https://gerrit.libreoffice.org/46260Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

odk/settings/settings.mk

@@ -358,6 +358,10 @@ ifeq "$(PROCTYPE)" "powerpc"
 CC_FLAGS+=-fPIC
 endif
 
+ifeq "$(PROCTYPE)" "x86"
+CC_FLAGS+=-m32
+endif
+
 SDK_JAVA_INCLUDES = -I"$(OO_SDK_JAVA_HOME)/include" -I"$(OO_SDK_JAVA_HOME)/include/linux"
 CC_INCLUDES=-I. -I$(OUT)/inc -I$(OUT)/inc/examples -I$(PRJ)/include
 CC_DEFINES_JNI=-DUNX -DGCC -DLINUX -DCPPU_ENV=$(CPPU_ENV)
@@ -372,9 +376,19 @@ LIBRARY_LINK_FLAGS=-shared -Wl,-z,origin '-Wl,-rpath,$$ORIGIN'
 ifeq "$(PROCTYPE)" "powerpc"
 LIBRARY_LINK_FLAGS+=-fPIC
 endif
+
+ifeq "$(PROCTYPE)" "x86"
+LIBRARY_LINK_FLAGS+=-m32
+endif
+
 COMP_LINK_FLAGS=$(LIBRARY_LINK_FLAGS)
 
 EXE_LINK_FLAGS=-Wl,--allow-shlib-undefined -Wl,-export-dynamic -Wl,-z,defs -Wl,--no-whole-archive
+
+ifeq "$(PROCTYPE)" "x86"
+EXE_LINK_FLAGS+=-m32
+endif
+
 LINK_LIBS=-L"$(OUT)/lib" -L"$(OO_SDK_HOME)/lib" -L"$(OO_SDK_URE_LIB_DIR)"
 LINK_JAVA_LIBS=-L"$(OO_SDK_JAVA_HOME)/jre/lib/$(JAVA_PROC_TYPE)" -L"$(OO_SDK_JAVA_HOME)/lib"