Build the js objects without PIC

This confuses emscripten now

Makefile

@@ -81,10 +81,13 @@ CPPFLAGS += -Iinclude -Ilib \
     -DOLMLIB_VERSION_PATCH=$(PATCH)
 
 # we rely on <stdint.h>, which was introduced in C99
-CFLAGS += -Wall -Werror -std=c99 -fPIC
-CXXFLAGS += -Wall -Werror -std=c++11 -fPIC
+CFLAGS += -Wall -Werror -std=c99
+CXXFLAGS += -Wall -Werror -std=c++11
 LDFLAGS += -Wall -Werror
 
+CFLAGS_NATIVE = -fPIC
+CXXFLAGS_NATIVE = -fPIC
+
 EMCCFLAGS = --closure 1 --memory-init-file 0 -s NO_FILESYSTEM=1 -s INVOKE_RUN=0 -s MODULARIZE=1
 
 # Olm generally doesn't need a lot of memory to encrypt / decrypt its usual
@@ -113,12 +116,12 @@ CPPFLAGS += -MMD
 
 ### per-target variables
 
-$(RELEASE_OBJECTS): CFLAGS += $(RELEASE_OPTIMIZE_FLAGS)
-$(RELEASE_OBJECTS): CXXFLAGS += $(RELEASE_OPTIMIZE_FLAGS)
+$(RELEASE_OBJECTS): CFLAGS += $(RELEASE_OPTIMIZE_FLAGS) $(CFLAGS_NATIVE)
+$(RELEASE_OBJECTS): CXXFLAGS += $(RELEASE_OPTIMIZE_FLAGS) $(CXXFLAGS_NATIVE)
 $(RELEASE_TARGET): LDFLAGS += $(RELEASE_OPTIMIZE_FLAGS)
 
-$(DEBUG_OBJECTS): CFLAGS += $(DEBUG_OPTIMIZE_FLAGS)
-$(DEBUG_OBJECTS): CXXFLAGS += $(DEBUG_OPTIMIZE_FLAGS)
+$(DEBUG_OBJECTS): CFLAGS += $(DEBUG_OPTIMIZE_FLAGS) $(CFLAGS_NATIVE)
+$(DEBUG_OBJECTS): CXXFLAGS += $(DEBUG_OPTIMIZE_FLAGS) $(CXXFLAGS_NATIVE)
 $(DEBUG_TARGET): LDFLAGS += $(DEBUG_OPTIMIZE_FLAGS)
 
 $(TEST_BINARIES): CPPFLAGS += -Itests/include