ci: Fix OPTS not being passed to OSX builds. #1774

Job	Run time
linux gcc --disable-ssl	3m 38s
linux clang --disable-ssl	3m 56s
linux gcc test 3.16	10m 23s
linux clang test 3.16 asan	16m 39s
linux gcc test --enable-shared	13m 40s
linux clang test --enable-shared	17m 2s
linux gcc test dpdk	20m 28s
linux clang test dpdk	16m 39s
linux gcc test -ljemalloc	9m 53s
linux clang test -ljemalloc	9m 56s
linux gcc 5.8 5.5 5.4 4.19	7m 15s
linux clang 5.8 5.5 5.4 4.19	10m 23s
linux gcc 4.14 4.9 4.4 3.16	6m 20s
linux clang 4.14 4.9 4.4 3.16	6m 32s
linux gcc afxdp 5.3	5m 16s
linux clang afxdp 5.3	4m 9s
linux gcc dpdk --enable-shared	11m 57s
linux clang dpdk --enable-shared	14m 51s
linux gcc dpdk-shared	10m 48s
linux clang dpdk-shared	11m 3s
linux gcc dpdk-shared --enable-shared	11m 48s
linux clang dpdk-shared --enable-shared	11m 49s
linux gcc m32 --disable-ssl	3m 53s
linux gcc deb	8m 24s
osx clang --disable-ssl	4m 6s
	4h 10m 48s

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