contrib: ebml: remove forced exception handling

Introduced in 2012 for x86 Android builds. It should be enabled directly by
CMake when building on modern systems.

libmatroska also throws some exception and was always compiled without this flag.

(cherry picked from commit 107a97ce)

Signed-off-by: Steve Lhomme <robux4@ycbcr.xyz>

contrib/src/ebml/rules.mak

@@ -16,10 +16,7 @@ ebml: libebml-$(EBML_VERSION).tar.xz .sum-ebml
 	$(UNPACK)
 	$(MOVE)
 
-# libebml requires exceptions
-EBML_CXXFLAGS := $(CXXFLAGS) $(PIC) -fexceptions
-
 .ebml: ebml toolchain.cmake
-	cd $< && $(HOSTVARS_PIC) CXXFLAGS="$(EBML_CXXFLAGS)" $(CMAKE) -DENABLE_WIN32_IO=OFF
+	cd $< && $(HOSTVARS_PIC) $(CMAKE) -DENABLE_WIN32_IO=OFF
 	cd $< && $(MAKE) install
 	touch $@