m4: remove equal sign from define directive in ax_valgrind_check.m4
Support for providing equal sign in define directives has been added only in GNU Make 3.82 [1] and it provides the same semantics (variables should be recursively expanded) as when it is omitted at all, so let's remove it in order to preserve compatibility with older GNU Make versions (like the one used on Travis). [1] https://git.savannah.gnu.org/cgit/make.git/tree/ChangeLog?h=3.82#n766 * m4/ax_valgrind_check.m4 <define valgrind_tool_rule>: Remove equal sign.
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@ -207,7 +207,7 @@ VALGRIND_LOG_COMPILER = \
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$(valgrind_lt) \
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$(VALGRIND) $(VALGRIND_SUPPRESSIONS) --error-exitcode=1 $(VALGRIND_FLAGS)
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define valgrind_tool_rule =
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define valgrind_tool_rule
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check-valgrind-$(1): $$(BUILT_SOURCES)
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ifeq ($$(VALGRIND_ENABLED)-$$(ENABLE_VALGRIND_$(1)),yes-yes)
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$$(valgrind_v_use)$$(MAKE) $$(AM_MAKEFLAGS) check-am \
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