See if building our own PCRE fixes the travis issues (JuliaLang#29162)

(cherry picked from commit d974f93)

Author: Keno

.travis.yml

@@ -80,7 +80,7 @@ before_install:
         BUILDOPTS="$BUILDOPTS USE_BINARYBUILDER_LLVM=1 LLVM_CONFIG=$TRAVIS_BUILD_DIR/usr/tools/llvm-config LLVM_SIZE=$TRAVIS_BUILD_DIR/usr/tools/llvm-size";
         BUILDOPTS="$BUILDOPTS VERBOSE=1 USE_BLAS64=0 SUITESPARSE_INC=-I$(brew --prefix suite-sparse-julia)/include FORCE_ASSERTIONS=1";
         BUILDOPTS="$BUILDOPTS LIBBLAS=-lopenblas LIBBLASNAME=libopenblas LIBLAPACK=-lopenblas LIBLAPACKNAME=libopenblas";
-        for lib in SUITESPARSE BLAS LAPACK GMP MPFR PCRE LIBUNWIND; do
+        for lib in SUITESPARSE BLAS LAPACK GMP MPFR LIBUNWIND; do
             BUILDOPTS="$BUILDOPTS USE_SYSTEM_$lib=1";
         done;
         export LDFLAGS="-L$(brew --prefix openblas-julia)/lib -L$(brew --prefix suite-sparse-julia)/lib";